# SkinPal AI

> Free skin and face analysis tools that run entirely in the browser — photos are processed on-device and never uploaded. Built by the team behind the SkinPal AI app (iOS and Android), which scans faces, scores skin in depth, and tracks it over time.

Every tool below is free, requires no signup, and states its methodology on the page (facial landmarks via MediaPipe FaceLandmarker, Lab color space measurement, disclosed scoring formulas). Results are cosmetic self-assessments, not medical advice.

## Skin tests

- [Skin type test](https://skinpalai.app/tools/skin-type-test): Eight questions to place you as dry, oily, combination, normal, or sensitive-leaning.
- [Acne severity test](https://skinpalai.app/tools/acne-severity-test): Six questions that place your breakouts on a mild-to-severe scale and explain the bands.
- [Dehydrated skin test](https://skinpalai.app/tools/skin-hydration-test): Tell dehydration apart from dry skin — one is a lack of water, the other a lack of oil.
- [AI skin analysis](https://skinpalai.app/tools/skin-analysis): Redness, tone evenness, shine and depth from one selfie, scored in your browser.
- [Skin & face age test](https://skinpalai.app/tools/skin-age-test): How old your face reads, estimated on your device — versus how old you are.
- [Fitzpatrick skin type](https://skinpalai.app/tools/fitzpatrick-skin-type): The dermatology-standard sun-response scale, types I to VI.
- [Acne type quiz](https://skinpalai.app/tools/acne-type-quiz): Hormonal, fungal, comedonal, or inflammatory — they need different approaches.
- [Purging or breaking out?](https://skinpalai.app/tools/purging-or-breakout): Whether to push through a new active or drop it.
- [Skin barrier check](https://skinpalai.app/tools/skin-barrier-test): Signs your barrier is compromised, and how far gone it is.
- [Fungal acne quiz](https://skinpalai.app/tools/fungal-acne-quiz): Those little uniform bumps might not be acne at all.
- [Redness & rosacea screener](https://skinpalai.app/tools/rosacea-screener): Flushing, persistent redness, or reactivity — sort out the pattern.
- [Blackheads or filaments?](https://skinpalai.app/tools/sebaceous-filaments-or-blackheads): The gray dots on your nose are probably not blackheads.
- [Pore visibility check](https://skinpalai.app/tools/pore-visibility-check): Where your pores read as visible, measured from a photo.
- [Dark circles test](https://skinpalai.app/tools/dark-circles-test): Pigment, shadow, or vascular — the fix depends on the type.

## Face analysis

- [Face shape detector](https://skinpalai.app/tools/face-shape-detector): Oval, round, square, heart, oblong, or diamond — measured, not guessed.
- [Face symmetry test](https://skinpalai.app/tools/face-symmetry-test): How symmetric your face is, point by point.
- [Golden ratio calculator](https://skinpalai.app/tools/golden-ratio-face): Your facial proportions against the classical ratios.
- [Canthal tilt test](https://skinpalai.app/tools/canthal-tilt-test): The angle of your eyes, measured in degrees.
- [Gonial angle calculator](https://skinpalai.app/tools/gonial-angle-calculator): The angle where your jaw turns up toward the ear, measured left and right from a photo.
- [fWHR calculator](https://skinpalai.app/tools/fwhr-calculator): Facial width-to-height ratio — cheekbone width against upper-face height.
- [Midface ratio](https://skinpalai.app/tools/midface-ratio): Pupil distance against midface height — the "compact midface" measurement.
- [Philtrum & chin ratio](https://skinpalai.app/tools/philtrum-ratio): How your lower third splits between philtrum and chin.
- [Jawline analysis](https://skinpalai.app/tools/jawline-rating): Gonial angle and definition, from one photo.
- [Eye shape detector](https://skinpalai.app/tools/eye-shape-detector): Almond, round, hooded, monolid, upturned, or downturned.
- [Lip shape detector](https://skinpalai.app/tools/lip-shape-detector): Full, wide, bow-shaped, or heart — and what flatters each.
- [Facial thirds & ratios](https://skinpalai.app/tools/facial-proportions): Upper, middle, and lower thirds — where yours differ.
- [Celebrity look alike](https://skinpalai.app/tools/celebrity-look-alike): Which celebrity your face is closest to, matched on your device. Your photo is never uploaded.
- [PSL score test](https://skinpalai.app/tools/psl-score): Your measured facial geometry placed on the 1 to 8 PSL scale, with the full tier chart.
- [Attractiveness test](https://skinpalai.app/tools/attractiveness-test): A facial harmony score from measured geometry — with honest limits.
- [Side profile analysis](https://skinpalai.app/tools/side-profile-analysis): Facial convexity and the E-line, measured from your profile photo.
- [Pupillary distance tool](https://skinpalai.app/tools/pupillary-distance): Your PD in millimeters from one photo — iris-scaled, for ordering glasses.
- [True mirror](https://skinpalai.app/tools/true-mirror): See your face the way other people do — un-mirrored.

## Color & tone

- [Eye color detector](https://skinpalai.app/tools/eye-color-detector): Reads your iris color from a photo on your device, corrected for the light, and names it: brown, hazel, amber, green, blue or gray.
- [Skin tone finder](https://skinpalai.app/tools/skin-tone-finder): Find your exact skin tone and depth from a photo — it never leaves your device.
- [Undertone test](https://skinpalai.app/tools/undertone-test): Warm, cool, neutral, or olive — from a photo, not vein-guessing.
- [Undertone quiz (no photo)](https://skinpalai.app/tools/vein-undertone-quiz): The classic vein, jewelry, and sun-response method, done properly.
- [Color season analysis](https://skinpalai.app/tools/color-season-analysis): Your 12-season color palette from a selfie.
- [Monk scale finder](https://skinpalai.app/tools/monk-skin-tone): Your tone on the 10-point Monk scale used in inclusive beauty.
- [Foundation shade matcher](https://skinpalai.app/tools/foundation-shade-matcher): Tone + undertone mapped to shade ranges across brands.
- [Hair color matcher](https://skinpalai.app/tools/hair-color-for-skin-tone): Hair colors that flatter your tone and undertone.
- [Lip color matcher](https://skinpalai.app/tools/lip-color-for-skin-tone): Nudes, reds, and berries that actually suit your undertone.

## Routine builders

- [30-day glow-up plan](https://skinpalai.app/tools/glow-up-plan): Answer seven questions, get a week-by-week plan built around your skin.
- [Routine builder](https://skinpalai.app/tools/routine-builder): A morning and night routine from your skin type and goals.
- [Routine order checker](https://skinpalai.app/tools/routine-order-checker): Put your products in the right order, morning and night.
- [Skin cycling scheduler](https://skinpalai.app/tools/skin-cycling-schedule): A 4-night cycle built around your actives and tolerance.
- [Retinol starter calculator](https://skinpalai.app/tools/retinol-starter): Which strength to start at and how fast to ramp.
- [Purge timeline calculator](https://skinpalai.app/tools/purge-timeline): How long a retinoid purge should last before it means stop.
- [Should you slug?](https://skinpalai.app/tools/slugging-quiz): Slugging helps some skin and clogs the rest. Which is yours?
- [Double cleansing quiz](https://skinpalai.app/tools/double-cleansing-quiz): Whether your routine actually needs two cleansers.
- [AM / PM routine splitter](https://skinpalai.app/tools/morning-night-splitter): Which of your products belong in the morning vs at night.
- [Travel routine minimizer](https://skinpalai.app/tools/travel-routine): Your routine cut down to what fits in a liquids bag.
- [SPF reapply calculator](https://skinpalai.app/tools/spf-reapply-calculator): When to reapply based on your day, not a generic rule.
- [UV index today](https://skinpalai.app/tools/uv-index): Live UV index for your location, hour by hour — and what it means for your skin.

## Glow-up match

- [Glasses finder](https://skinpalai.app/tools/glasses-for-face-shape): Frames that flatter your face shape.
- [Hairstyle finder](https://skinpalai.app/tools/hairstyle-for-face-shape): Cuts and lengths matched to your face shape.
- [Brow shape finder](https://skinpalai.app/tools/brow-shape-finder): The brow shape that balances your features.
- [Eyebrow mapping tool](https://skinpalai.app/tools/eyebrow-mapping): Your brow start, arch, and end points mapped on your photo.
- [Blush placement map](https://skinpalai.app/tools/blush-placement): Where blush goes on your face shape — lifted, not dated.
- [Contour map](https://skinpalai.app/tools/contour-map): A contour and highlight map drawn for your face shape.
- [Hair parting finder](https://skinpalai.app/tools/hair-parting-finder): Middle, side, or deep side — what your face shape says.
- [Lash style picker](https://skinpalai.app/tools/lash-style-picker): Lash maps and styles for your eye shape.
- [Earring style finder](https://skinpalai.app/tools/earring-style-finder): Hoops, studs, or drops — matched to your face shape.
- [Acne scar identifier](https://skinpalai.app/tools/acne-scar-identifier): Ice pick, boxcar, rolling, or PIH — each fades differently.

## Products & ingredients

- [Ingredient conflict checker](https://skinpalai.app/tools/ingredient-conflict-checker): Pick your actives and see which combinations to separate — and which conflicts are myths.
- [Ingredient list analyzer](https://skinpalai.app/tools/ingredient-analyzer): Paste any ingredient list, get a plain-English breakdown.
- [Fungal acne safe checker](https://skinpalai.app/tools/fungal-acne-safe-checker): Paste an ingredient list and see which ingredients feed malassezia, the yeast behind fungal acne.
- [Pregnancy-safe skincare checker](https://skinpalai.app/tools/pregnancy-safe-skincare-checker): Flags ingredients that commonly appear on avoid-in-pregnancy lists, as a heads-up for your doctor.
- [Pore-clogging ingredient checker](https://skinpalai.app/tools/comedogenic-checker): Paste a product, or browse the full list with comedogenic ratings.
- [Moisturizer picker](https://skinpalai.app/tools/moisturizer-picker): Gel, lotion, cream, or balm — by skin type and climate.
- [Sunscreen finder](https://skinpalai.app/tools/sunscreen-finder): Chemical or mineral, and which finish works for your skin.
- [Product expiry checker](https://skinpalai.app/tools/product-shelf-life): How long that opened jar is actually good for.
- [Routine cost calculator](https://skinpalai.app/tools/skincare-cost-calculator): What your routine costs per month — and where the money goes.

## Guides

Plain-language answers on combining skincare actives — which pairs to separate across morning and night, which layer fine, and which conflicts are myths.

- [Amber eyes](https://skinpalai.app/guides/amber-eyes): One even golden or copper color across the whole iris, with no green anywhere.
- [Azelaic Acid + Benzoyl Peroxide](https://skinpalai.app/guides/azelaic-acid-and-benzoyl-peroxide): Can be combined, with care.
- [Azelaic Acid + Copper Peptides](https://skinpalai.app/guides/azelaic-acid-and-copper-peptides): Can be combined, with care.
- [Azelaic Acid + Glycolic Acid](https://skinpalai.app/guides/azelaic-acid-and-glycolic-acid): Can be combined, with care.
- [Azelaic Acid + Hyaluronic Acid](https://skinpalai.app/guides/azelaic-acid-and-hyaluronic-acid): Fine to use together.
- [Azelaic Acid + Niacinamide](https://skinpalai.app/guides/azelaic-acid-and-niacinamide): Fine to use together.
- [Azelaic Acid + Peptides](https://skinpalai.app/guides/azelaic-acid-and-peptides): Fine to use together.
- [Azelaic Acid + Retinol](https://skinpalai.app/guides/azelaic-acid-and-retinol): Can be combined, with care.
- [Azelaic Acid + Salicylic Acid](https://skinpalai.app/guides/azelaic-acid-and-salicylic-acid): Can be combined, with care.
- [Azelaic Acid + Vitamin C](https://skinpalai.app/guides/azelaic-acid-and-vitamin-c): Fine to use together.
- [Back and chest acne](https://skinpalai.app/guides/back-and-chest-acne): Sweat, friction, and often fungal, which is why it is stubborn.
- [Beginner routine](https://skinpalai.app/guides/beginner-skincare-routine): Cleanser, moisturizer, sunscreen. That is the routine.
- [Benzoyl Peroxide + Copper Peptides](https://skinpalai.app/guides/benzoyl-peroxide-and-copper-peptides): Use them at different times.
- [Benzoyl Peroxide + Hyaluronic Acid](https://skinpalai.app/guides/benzoyl-peroxide-and-hyaluronic-acid): Fine to use together.
- [Benzoyl Peroxide + Niacinamide](https://skinpalai.app/guides/benzoyl-peroxide-and-niacinamide): Fine to use together.
- [Benzoyl Peroxide + Peptides](https://skinpalai.app/guides/benzoyl-peroxide-and-peptides): Can be combined, with care.
- [Benzoyl Peroxide + Retinol](https://skinpalai.app/guides/benzoyl-peroxide-and-retinol): Use them at different times.
- [Benzoyl Peroxide + Vitamin C](https://skinpalai.app/guides/benzoyl-peroxide-and-vitamin-c): Use them at different times.
- [Blue eyes](https://skinpalai.app/guides/blue-eyes): Almost no pigment in the front of the iris; the blue is scattered light, not a pigment.
- [Bright Spring palette](https://skinpalai.app/guides/bright-spring-color-palette): Clear and saturated with warmth behind it: vivid colors hold up against your contrast.
- [Bright Winter palette](https://skinpalai.app/guides/bright-winter-color-palette): Clear and cool: jewel colors at full saturation suit you, muted and earthy shades look tired.
- [Brow position](https://skinpalai.app/guides/brow-position): At or a little above the orbital rim is typical; resting on or below it reads as heaviness.
- [Brown eyes](https://skinpalai.app/guides/brown-eyes): The most common eye color; brown pigment runs from the pupil to the edge with no green zone.
- [Canthal tilt](https://skinpalai.app/guides/canthal-tilt): Roughly 0° to 8° positive is typical; below 0° the eye reads downturned to other people.
- [Central heterochromia](https://skinpalai.app/guides/central-heterochromia): A different-colored ring around the pupil, present since childhood, is a benign pigment pattern.
- [Chin projection](https://skinpalai.app/guides/chin-projection): Within a few millimeters of a vertical dropped from the lower lip is typical.
- [Color seasons](https://skinpalai.app/guides/color-seasons-explained): A useful organizing system, not science.
- [Convex vs straight](https://skinpalai.app/guides/convex-vs-straight-profile): Forehead, nose base and chin usually meet at roughly 165° to 175°.
- [Copper Peptides + Hyaluronic Acid](https://skinpalai.app/guides/copper-peptides-and-hyaluronic-acid): Fine to use together.
- [Copper Peptides + Niacinamide](https://skinpalai.app/guides/copper-peptides-and-niacinamide): Fine to use together.
- [Copper Peptides + Peptides](https://skinpalai.app/guides/copper-peptides-and-peptides): Fine to use together.
- [Copper Peptides + Retinol](https://skinpalai.app/guides/copper-peptides-and-retinol): Can be combined, with care.
- [Copper Peptides + Vitamin C](https://skinpalai.app/guides/copper-peptides-and-vitamin-c): Use them at different times.
- [Damaged barrier vs sensitive skin](https://skinpalai.app/guides/damaged-barrier-vs-sensitive-skin): A damaged barrier is recent and recovers; sensitivity is baseline.
- [Deep Autumn palette](https://skinpalai.app/guides/deep-autumn-color-palette): Deep and warm: dark earth tones suit you, while pastels look washed out against your depth.
- [Deep set vs hooded](https://skinpalai.app/guides/deep-set-vs-hooded-eyes): Deep set shows a shadowed gap between brow bone and lid.
- [Deep Winter palette](https://skinpalai.app/guides/deep-winter-color-palette): Deep and cool: dark saturated colors suit you, while pastels look thin and camel dulls the skin.
- [Dehydrated vs dry skin](https://skinpalai.app/guides/dehydrated-vs-dry-skin): Oily and tight at once means dehydrated, not dry.
- [Dehydration lines vs wrinkles](https://skinpalai.app/guides/dehydration-lines-vs-wrinkles): Dehydration lines vanish with hydration; wrinkles do not.
- [Face exercises](https://skinpalai.app/guides/do-face-exercises-work): Very limited evidence; aggressive versions may backfire.
- [Bone smashing](https://skinpalai.app/guides/does-bone-smashing-work): No, and it can cause permanent damage.
- [Chewing gum for jawline](https://skinpalai.app/guides/does-chewing-gum-help-jawline): Adds muscle width, not definition, and risks jaw pain.
- [Face and mouth taping](https://skinpalai.app/guides/does-face-taping-work): No lasting change, and mouth taping can be dangerous.
- [Jaw exercisers](https://skinpalai.app/guides/does-jaw-exercise-equipment-work): No structural change, and real jaw joint risk.
- [Mewing](https://skinpalai.app/guides/does-mewing-work): Harmless as a posture, but no controlled evidence that it changes adult facial bone.
- [Skin icing](https://skinpalai.app/guides/does-skin-icing-work): Briefly reduces puffiness; nothing lasting.
- [Double cleansing](https://skinpalai.app/guides/double-cleansing): Useful for sunscreen and makeup, not for bare skin.
- [Eye color chart](https://skinpalai.app/guides/eye-color-chart): Ordered by pigment: dark brown, brown, amber, hazel, green, gray, blue; each has one defining sign.
- [Eye spacing](https://skinpalai.app/guides/eye-spacing): About one eye width between the inner corners is typical.
- [Facial symmetry](https://skinpalai.app/guides/facial-symmetry): Under about 3% difference is universal; past roughly 6 to 8% it is visible to others.
- [Facial thirds](https://skinpalai.app/guides/facial-thirds): Within a few percent of each other reads balanced; a tenth longer and that section reads long.
- [Fitzpatrick scale](https://skinpalai.app/guides/fitzpatrick-scale): It measures UV response, not skin color.
- [Foundation matching](https://skinpalai.app/guides/foundation-shade-matching): Depth and undertone both have to match.
- [Fungal vs bacterial acne](https://skinpalai.app/guides/fungal-acne-vs-bacterial-acne): Fungal acne is uniform, often itchy, and has no blackheads.
- [fWHR](https://skinpalai.app/guides/fwhr): Roughly 1.7 to 2.0 covers most adults; above about 2.0 the face reads broad, below about 1.7 it reads long and narrow.
- [Glycolic Acid + Benzoyl Peroxide](https://skinpalai.app/guides/glycolic-acid-and-benzoyl-peroxide): Can be combined, with care.
- [Glycolic Acid + Copper Peptides](https://skinpalai.app/guides/glycolic-acid-and-copper-peptides): Use them at different times.
- [Glycolic Acid + Hyaluronic Acid](https://skinpalai.app/guides/glycolic-acid-and-hyaluronic-acid): Fine to use together.
- [Glycolic Acid + Peptides](https://skinpalai.app/guides/glycolic-acid-and-peptides): Can be combined, with care.
- [Glycolic Acid + Retinol](https://skinpalai.app/guides/glycolic-acid-and-retinol): Use them at different times.
- [Glycolic Acid + Salicylic Acid](https://skinpalai.app/guides/glycolic-acid-and-salicylic-acid): Can be combined, with care.
- [Glycolic Acid + Vitamin C](https://skinpalai.app/guides/glycolic-acid-and-vitamin-c): Can be combined, with care.
- [Golden ratio face](https://skinpalai.app/guides/golden-ratio-face): Distance from 1.618 predicts nothing; thirds and width to height are the ratios with real thresholds.
- [Gonial angle](https://skinpalai.app/guides/gonial-angle): About 110° to 130° is typical; past roughly 140° there is no visible jaw corner in profile.
- [Gray eyes (grey eyes)](https://skinpalai.app/guides/gray-eyes): Silvery or slate with no steady blue in daylight; a blue eye stays clearly blue.
- [Green eyes](https://skinpalai.app/guides/green-eyes): Green across most of the iris, with at most a thin gold ring at the pupil.
- [Hair color](https://skinpalai.app/guides/hair-color-for-skin-tone): Match the undertone, then pick the contrast.
- [Hazel eyes](https://skinpalai.app/guides/hazel-eyes): Brown or gold near the pupil, green toward the edge; one even color all the way out is not hazel.
- [Hazel vs brown eyes](https://skinpalai.app/guides/hazel-vs-brown-eyes): Green or olive visible in the outer iris in daylight means hazel; brown from pupil to edge means brown.
- [Heterochromia](https://skinpalai.app/guides/heterochromia): Present since early childhood is usually harmless; a new change in one eye as an adult needs an eye doctor.
- [Time to results](https://skinpalai.app/guides/how-long-skincare-takes-to-work): Eight to twelve weeks for most visible change.
- [Sunscreen amount](https://skinpalai.app/guides/how-much-sunscreen-to-use): About a quarter teaspoon for the face.
- [Find your season](https://skinpalai.app/guides/how-to-find-your-color-season): Undertone, then depth, then contrast.
- [Find your undertone](https://skinpalai.app/guides/how-to-find-your-undertone): Undertone is the constant beneath your tan.
- [Patch testing](https://skinpalai.app/guides/how-to-patch-test): Same spot, twice daily, for five to seven days.
- [Starting retinol](https://skinpalai.app/guides/how-to-start-retinol): Low strength, twice a week, build up slowly.
- [Hunter eyes](https://skinpalai.app/guides/hunter-eyes): Present when a projecting brow bone shadows a mostly covered lid with a level or upward tilt.
- [Hyaluronic Acid + Peptides](https://skinpalai.app/guides/hyaluronic-acid-and-peptides): Fine to use together.
- [Hyaluronic Acid + Retinol](https://skinpalai.app/guides/hyaluronic-acid-and-retinol): Fine to use together.
- [Hyaluronic Acid + Vitamin C](https://skinpalai.app/guides/hyaluronic-acid-and-vitamin-c): Fine to use together.
- [Pupillary distance](https://skinpalai.app/guides/interpupillary-distance): Most adults measure 54 to 74 mm, and a 2 mm error in a strong prescription causes strain.
- [Buccal fat removal](https://skinpalai.app/guides/is-buccal-fat-removal-worth-it): Real surgery, permanent, and commonly regretted later.
- [Light Spring palette](https://skinpalai.app/guides/light-spring-color-palette): Warm and light: sunlit pastels lift you, while black and dusty greys drain the face.
- [Light Summer palette](https://skinpalai.app/guides/light-summer-color-palette): Cool and light: powdery blues and roses suit you, while black and warm earth tones overwhelm.
- [Lip color](https://skinpalai.app/guides/lip-color-for-skin-tone): Undertone picks the family, intensity the shade.
- [Looksmaxxing](https://skinpalai.app/guides/looksmaxxing): Soft changes work; bone only moves with surgery; bone smashing and DIY devices hurt.
- [Lower third](https://skinpalai.app/guides/lower-third-balance): Upper lip segment about a third of the lower third is the reference.
- [Maxilla](https://skinpalai.app/guides/maxilla-and-face-structure): Adult maxillary position is fixed: a flat midface is a surgical finding, not a posture one.
- [Melasma vs hyperpigmentation](https://skinpalai.app/guides/melasma-vs-hyperpigmentation): Melasma is symmetric with map-like edges; other marks are not.
- [Midface ratio](https://skinpalai.app/guides/midface-ratio): Near 1.0 is the reference; below roughly 0.9 the midface reads long, above about 1.1 it reads compressed.
- [Milia vs whiteheads](https://skinpalai.app/guides/milia-vs-whiteheads): Milia are hard, fixed and do not change; whiteheads do.
- [Mogged](https://skinpalai.app/guides/mogged-meaning): Outshone by comparison, and in photos the comparison is usually camera distance and lighting, not the faces.
- [Monk skin tone scale](https://skinpalai.app/guides/monk-skin-tone-scale): Ten points, built to describe color fairly.
- [Morning vs night](https://skinpalai.app/guides/morning-vs-night-routine): Morning protects, night repairs.
- [Negative canthal tilt](https://skinpalai.app/guides/negative-canthal-tilt): A degree or two below level is common; past a few degrees negative the eye reads downturned.
- [Neoteny](https://skinpalai.app/guides/neoteny): Present when the lower third measures clearly short and the eye region large.
- [Neutral undertone](https://skinpalai.app/guides/neutral-undertone): Balanced, not simply hard to read.
- [Niacinamide + Glycolic Acid](https://skinpalai.app/guides/niacinamide-and-glycolic-acid): Can be combined, with care.
- [Niacinamide + Hyaluronic Acid](https://skinpalai.app/guides/niacinamide-and-hyaluronic-acid): Fine to use together.
- [Niacinamide + Peptides](https://skinpalai.app/guides/niacinamide-and-peptides): Fine to use together.
- [Niacinamide + Retinol](https://skinpalai.app/guides/niacinamide-and-retinol): Fine to use together.
- [Niacinamide + Salicylic Acid](https://skinpalai.app/guides/niacinamide-and-salicylic-acid): Fine to use together.
- [Niacinamide + Vitamin C](https://skinpalai.app/guides/niacinamide-and-vitamin-c): The conflict is a myth.
- [Nose to lip ratio](https://skinpalai.app/guides/nose-to-lip-ratio): Mouth about 1.5 times nose width is the reference; under 1.3 the nose reads wide, over 1.7 the mouth does.
- [Ogee curve](https://skinpalai.app/guides/ogee-curve): Present when the cheek line bulges then hollows in three-quarter view.
- [Olive undertone](https://skinpalai.app/guides/olive-undertone): A green cast, not simply a warm one.
- [Peptides + Retinol](https://skinpalai.app/guides/peptides-and-retinol): Fine to use together.
- [Peptides + Vitamin C](https://skinpalai.app/guides/peptides-and-vitamin-c): Can be combined, with care.
- [Philtrum length](https://skinpalai.app/guides/philtrum-length): Roughly 11 to 15 mm is typical in adults; past about 18 mm the upper lip reads long.
- [Pimple between eyebrows](https://skinpalai.app/guides/pimple-between-eyebrows): Oil, brow products, and plucking, not your liver.
- [Pimple on cheeks](https://skinpalai.app/guides/pimple-on-cheeks): Usually contact and products, not your lungs.
- [Pimple on chin](https://skinpalai.app/guides/pimple-on-chin): Usually hormonal or friction, not your gut.
- [Pimple on forehead](https://skinpalai.app/guides/pimple-on-forehead): Usually hair products, fringe, or sweat, not digestion.
- [Pimple on hairline](https://skinpalai.app/guides/pimple-on-hairline): Product buildup and sweat, often fungal, not organs.
- [Pimple on jawline](https://skinpalai.app/guides/pimple-on-jawline): The hormonal zone, plus straps and shaving.
- [Pimple on lip line](https://skinpalai.app/guides/pimple-on-lip-line): Usually balm or friction, but rule out a cold sore.
- [Pimple on nose](https://skinpalai.app/guides/pimple-on-nose): Oil density and filaments, not your heart.
- [Pimple on temples](https://skinpalai.app/guides/pimple-on-temples): Glasses, headphones, and hair product, not kidneys.
- [PSL score chart](https://skinpalai.app/guides/psl-score-chart): 4 is average by design, most real faces land between 3 and 5.
- [Purging vs breakout](https://skinpalai.app/guides/purging-vs-breakout): Purging is faster and only where you already break out.
- [Rarest eye color](https://skinpalai.app/guides/rarest-eye-color): Green is usually cited as the rarest common color, at roughly 2 percent; gray and red are rarer but poorly counted.
- [Retinol + Vitamin C](https://skinpalai.app/guides/retinol-and-vitamin-c): Use them at different times.
- [Rosacea vs acne](https://skinpalai.app/guides/rosacea-vs-acne): Rosacea flushes and has no comedones; acne does.
- [Salicylic Acid + Benzoyl Peroxide](https://skinpalai.app/guides/salicylic-acid-and-benzoyl-peroxide): Can be combined, with care.
- [Salicylic Acid + Copper Peptides](https://skinpalai.app/guides/salicylic-acid-and-copper-peptides): Use them at different times.
- [Salicylic Acid + Hyaluronic Acid](https://skinpalai.app/guides/salicylic-acid-and-hyaluronic-acid): Fine to use together.
- [Salicylic Acid + Peptides](https://skinpalai.app/guides/salicylic-acid-and-peptides): Can be combined, with care.
- [Salicylic Acid + Retinol](https://skinpalai.app/guides/salicylic-acid-and-retinol): Use them at different times.
- [Salicylic Acid + Vitamin C](https://skinpalai.app/guides/salicylic-acid-and-vitamin-c): Can be combined, with care.
- [Filaments vs blackheads](https://skinpalai.app/guides/sebaceous-filaments-vs-blackheads): Filaments are uniform and refill; blackheads are darker and irregular.
- [Facial dimorphism](https://skinpalai.app/guides/sexual-dimorphism-face): One feature past the average for the other sex is common; three or four together is what reads across a room.
- [Skin cycling](https://skinpalai.app/guides/skin-cycling): Exfoliate, retinoid, recover, recover, repeat.
- [Routine order](https://skinpalai.app/guides/skincare-routine-order): Thinnest to thickest, sunscreen always last.
- [Slugging](https://skinpalai.app/guides/slugging): Good for dry skin, risky if you are acne-prone.
- [Soft Autumn palette](https://skinpalai.app/guides/soft-autumn-color-palette): Muted and warm: softened earth tones suit you, while icy pastels and pure black drain the face.
- [Soft Summer palette](https://skinpalai.app/guides/soft-summer-color-palette): Muted and cool: colors with grey in them suit you, while neon and pure black overpower the face.
- [Texture vs acne scars](https://skinpalai.app/guides/texture-vs-acne-scars): Texture changes over weeks; scars stay exactly where they are.
- [True Autumn palette](https://skinpalai.app/guides/true-autumn-color-palette): Warm and rich: full-strength earth tones suit you, while icy pastels and black drain the face.
- [True Spring palette](https://skinpalai.app/guides/true-spring-color-palette): Warm and clear: golden and coral tones lift you, while dusty and icy shades flatten the face.
- [True Summer palette](https://skinpalai.app/guides/true-summer-color-palette): Cool and softened: blue-based mid-tones suit you, warm gold and stark contrast do not.
- [True Winter palette](https://skinpalai.app/guides/true-winter-color-palette): Cool, deep and clear: blue-based colors suit you, warm gold and muted earth turn the skin sallow.
- [Upper eyelid exposure](https://skinpalai.app/guides/upper-eyelid-exposure): Roughly 2 to 5 mm of visible lid is typical; a fold that hides the lash line reads hooded.
- [Vein test](https://skinpalai.app/guides/vein-test-undertone): Popular, but a weak signal, use paper instead.
- [Warm vs cool](https://skinpalai.app/guides/warm-vs-cool-undertone): Golden reads warm, pink reads cool.

## App

- [SkinPal AI on the App Store](https://apps.apple.com/app/id6749782285)
- [SkinPal AI on Google Play](https://play.google.com/store/apps/details?id=com.skinpalai.app)