Salicylic acid is used on the skin to treat psoriasis and other dry, scaly skin conditions. This medication is also used to help remove dead skin from warts, the palms of the hands, and the soles of the feet. It belongs to the same class of drugs as aspirin (salicylates). This medication should not be used by children younger than 2 years.Salicylic acid causes the skin to shed dead cells from its top layer by increasing the amount of moisture in the skin and dissolving the "cement" between the cells. This makes it easier to shed the skin cells, softens the top layer of skin, and decreases scaling and dryness