Retinoids are vitamin A derivatives that bind retinoic acid receptors to normalize keratinization, increase epidermal cell turnover, and stimulate collagen synthesis. They are widely used for acne, photoaging, and pigmentation concerns.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation (redness, stinging, burning) | Common | Most prominent during the initial weeks of use, often called the retinization period. |
| Dryness and peeling/flaking | Common | Result of accelerated epidermal turnover; usually improves as skin acclimates. |
| Increased photosensitivity | Common | Sunscreen use is recommended; retinoids are typically applied at night. |
| Purging (transient acne flare) | Uncommon | Temporary worsening of breakouts as comedones surface early in treatment. |
| Contact dermatitis or allergic reaction | Rare | True hypersensitivity is uncommon; irritant reactions are far more frequent. |
| Teratogenicity with oral/systemic retinoids | Rare | A serious concern for systemic retinoids; topical absorption is low but caution is advised in pregnancy. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.