How Prismal works.

What we measure

Twelve clinical-grade measurements derived from published dermatological scales: Fitzpatrick / ITA for skin type, sun damage and pigmentation patterns, redness and erythema, wrinkle severity by zone, pore visibility, surface texture, volume loss, acne severity, under-eye darkness and puffiness, skin firmness, hydration / dullness, and a composite Skin Score.

The full per-measurement methodology, including how each is computed, what it’s derived from, and the confidence ranges, will live here in v1.

The Skin Score

Your Skin Score is a weighted composite of the eleven non-classification measurements, calibrated against your age cohort. It’s not absolute — a 72 means “72nd percentile for your demographic,” not “72/100 of perfection.” Weights are public.

If your score would be below 40, we don’t show a number. We surface a recommendation to consult a dermatologist instead.

What we will not claim

• Prismal is not a medical diagnostic.
• We describe observations. We do not diagnose conditions or identify causes.
• We do not recommend prescription medications.
• We never compare you to a celebrity or a named individual.
• We never recommend an in-clinic injectable to anyone under 25, or any in-clinic aesthetic service to anyone under 21.

How we make money

Two ways. When you book a treatment with a Seattle provider we matched you with, the provider may pay us a referral fee. When you buy a recommended skincare product through our link, we may earn an affiliate commission. Both relationships are disclosed on every recommendation card.

We default to the lowest-effective-cost product when several equivalent options exist. CeraVe before Goop.