Glycolic acid is an alpha-hydroxy acid derived from sugar cane that exfoliates by loosening bonds between dead skin cells on the surface, promoting cell turnover and improving texture, tone, and fine lines. It is one of the smallest AHAs, allowing relatively deep penetration into the skin.
| Reported effect | How often | Notes |
|---|---|---|
Skin irritation, stinging, or burning sensation | Common | Often dose- and concentration-dependent, especially at low pH or high percentages. |
Redness (erythema) | Common | Usually transient and resolves after application or with reduced frequency. |
Dryness and peeling | Common | Result of increased exfoliation; mitigated by moisturizer use. |
Increased photosensitivity (sun sensitivity) | Common | AHAs reduce stratum corneum thickness; daily sunscreen is advised. |
Post-inflammatory hyperpigmentation | Uncommon | More likely in darker skin tones or with overuse/irritation. |
Contact dermatitis or allergic reaction | Rare | Genuine allergy is uncommon; most reactions are irritant rather than allergic. |
Chemical burns or blistering | Rare | Typically associated with high concentrations, low pH, or prolonged contact in peels. |
Scarring | Very rare | Reported with improper high-strength peel application or severe burns. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.