BHA (beta hydroxy acid), most commonly salicylic acid, is an oil-soluble exfoliant that penetrates pores to dissolve excess sebum and dead skin cells. It is widely used to treat acne, blackheads, and to improve skin texture and oiliness.
| Reported effect | How often | Notes |
|---|---|---|
| Skin dryness and peeling | Common | Mild flaking or tightness, especially during initial use or at higher concentrations. |
| Stinging, burning, or irritation | Common | Transient sensation on application, more likely on sensitive or compromised skin. |
| Erythema (redness) | Uncommon | Temporary redness that usually subsides; may persist with overuse. |
| Increased photosensitivity | Uncommon | Enhanced sun sensitivity; daily sunscreen is recommended. |
| Contact dermatitis or allergic reaction | Rare | Itching, rash, or hives in sensitized individuals. |
| Salicylate toxicity (salicylism) | Very rare | Reported only with extensive application over large body areas, particularly in children or with high concentrations. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.