Dermatitis is skin inflammation that is usually red and itchy and may create blisters. Seborrheic dermatitis creates greasy, yellow or red scaling on hairy areas of the body such as the scalp or genitals. In infants, it is known as cradle cap. It can also appear in skin creases in the arms, legs, breasts, and elsewhere. Treating seborrheic dermatitis may include hydrocortisone creams, dandruff shampoos, saliclyic acid, and more. Follow the links below to find WebMD's comprehensive coverage about what causes seborrheic dermatitis, what it looks like, how to treat it, and much more.