Betamethasone Valerate Foam 0.12% by Perrigo (Rx)Betamethasone Valerate Foam 0. 12% is a topical corticosteroid skin treatment that contains betamethasone valerate, USP, a synthetic corticosteroid, for topical dermatologic use. The corticosteroids constitute a class of primarily synthetic steroids used topically as anti inflammatory agents. Betamethasone Valerate Foam 0. 12% is a steroid used to treat inflammation and itching caused by a number of skin conditions such as allergic reactions, eczema,