Desonide is used to treat the redness, swelling, itching, and discomfort of various skin conditions, including psoriasis (a skin disease in which red, scaly patches form on some areas of the body and eczema (a skin disease that causes the skin to be dry and itchy and to sometimes develop red, scaly rashes). Desonide is in a class of medications called topical corticosteroids. It works by activating natural substances in the skin to reduce swelling, redness, and itching.