Seborrheic dermatitis - Diagnosis and treatment - Mayo Clinic The best approach for you depends on your skin type, the severity of your condition, and whether your symptoms affect your scalp or other areas of your body. ... Avoid harsh soaps and use a moisturizer. Apply a medicated cream. ... If you have a beard or mustache, shampoo facial hair regularly. Seborrheic dermatitis can be worse under mustaches ...