Take on trouble spots with Differin Acne-Prone Skin Patches. Formulated with salicylic acid, these patches exfoliate to help shrink the appearance of imperfections. These invisible ultra-thin patches are makeup-friendly, waterproof, and sweatproof, so you can wear them day and night. The triple-action�technology�starts working fast to flatten, soothe, and protect the area. Dermatologist-tested, the patches are for all skin types, including acne-prone skin. Each box comes with 36 clear, easy-to-peel patches (18 small and 18 large) for any imperfection emergency.�After cleaning and drying the area, place a patch on the imperfection. Leave it on for 4 to 12 hours, remove, and discard. Reapply a new patch as necessary.