Block B is a chemical exfoliant that promotes shedding of surface skin cells to improve texture, tone, and pore appearance. It is typically used in leave-on or rinse-off formulations at controlled concentrations and pH.
| Reported effect | How often | Notes |
|---|---|---|
Skin irritation and stinging | Common | Mild tingling or burning, especially on first use or at higher concentrations. |
Dryness and flaking | Common | Increased cell turnover can cause visible peeling or tightness. |
Redness (erythema) | Common | Transient redness shortly after application. |
Increased photosensitivity | Common | Heightened sun sensitivity; daily sunscreen is advised. |
Contact dermatitis | Uncommon | Allergic or irritant reaction with persistent rash or itching. |
Post-inflammatory hyperpigmentation | Uncommon | More likely in darker skin tones following irritation. |
Chemical burn | Rare | Associated with overuse, high concentrations, or low pH formulations. |
Severe systemic allergic reaction | Very rare | Anaphylaxis-type response reported only in isolated cases. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.