La Roche-Posay Effaclar Duo (+) is a popular dual-action moisturizer for oily, acne-prone skin, targeting pimples, blackheads, and post-acne marks with ingredients like Salicylic Acid, Niacinamide, and LHA, providing 24-hour hydration, shine control, and an anti-relapse effect, available in original and SPF versions for comprehensive blemish management.