Betaderm ointment is used to reduce redness, itching and swelling associated with skin conditions that include eczema, dermatitis, allergies and rashes. WebMD states that Betaderm is classified as a medium-strength corticosteroid.Betaderm is formulated for use on the skin only, states WebMD. It should not be used on the face, groin or underarms unless specifically directed by a doctor. Before applying Betaderm ointment, it is important to clean and dry the affected area. Betaderm should be applied in a thin layer and gently rubbed in. Bandages, covers and wraps are not advised unless recommended by a doctor. WebMD cautions against getting this medication in the eyes, nose or mouth.. Betaderm ointment is used to reduce redness, itching and swelling associated with skin conditions that include eczema, dermatitis, allergies and rashes.. Betaderm: Betamethasone valerate belongs to the class of medications called topical corticosteroids. It is used to treat skin irritation and itch caused by skin conditions such as eczema, psoriasis, contact dermatitis, and seborrhea. It works by reducing redness, inflammation, swelling, and irritation of the skin..