COSRX — BHA Blackhead Power Liquid 100ml

BHA Blackhead Power Liquid is a thoughtfully formulated BHA treatment designed for tolerance. Most BHAs use pure salicylic acid, which is more irritating. Here, COSRX has chosen betaine salicylate—the salt form of salicylic acid, which penetrates pores in the same way but with less risk of irritation. Salix Alba Bark Water as the first ingredient is an active base naturally containing salicin (a precursor of salicylic acid in vivo)—this dual system of betaine salicylate + willow bark water creates a comprehensive yet gradual BHA effect. Niacinamide in fourth position adds a welcome brightening dimension for post-blemish marks. The 10-ingredient formula is clean, fragrance-free, and vegan. Important points for pharmacy advice: (1) Gradual introduction is MANDATORY—start at once a week, then increase gradually. Initial irritation is normal but will subside. (2) SPF 30+ is mandatory the day after use. (3) Do not combine with AHA, BHA, retinol, or concentrated vitamin C on application days—risk of over-exfoliation. (4) Contraindicated for pregnancy and breastfeeding—the brand is explicit about this in its FAQ. Challenge on the packaging flag doc (conditional_pregnancy): the manufacturer's explicit statement "Avoid AHAs BHAs when pregnant" justifies the more restrictive contra_indicated_pregnancy classification. Phototypes IV-VI: Betaine salicylate is documented as a BHA suitable for darker skin (no additional PIH risk versus classic AHAs). Catalog positioning: BHA slot in the CLEAR pack, complementary to COSRX Niacinamide 15% for blemish-prone skin with marks.