La Roche-Posay Effaclar Duo Dual Action Acne Treatment with Benzoyl Peroxide reduces the number and severity of acne blemishes, pimples, blackheads and whiteheads. Formulated with 5.5% micronized benzoyl peroxide and micro-exfoliating lipo-hydroxy acid, this acne spot treatment provides fast and visible results in less than 3 days.