A pack of 32 hydrocolloid patches made with salicylic acid. A well-known beta hydroxy acid [BHA], salicylic acid helps visibly shrink and soothe spots by dissolving dead skin cells and unclogging pores. Hydrocolloid is a material that’s clinically proven to absorb fluid and help reduce the appearance of inflammation to shrink spots overnight. Perfectly shaped to grip the contours of the face, Hydro-Star + Salicylic Acid is designed to really stick. They shield spots from outside bacteria and serve as a gentle reminder to avoid skin picking.