Retinoid
| Field | Medicine |
|---|---|
| Also known as | tretinoin, retinol, adapalene
|
A retinoid is a vitamin-A derivative used on skin for acne and photoaging (tretinoin, adapalene, weaker retinol). It is a derm tool. Purge, sun sensitivity, and "start slow" are the actual instructions — from a clinician, not from a stack screenshot.