Seborrheic dermatitis is a common skin condition that mainly affects the scalp. It causes scaly patches, red skin, and stubborn dandruff. Seborrheic dermatitis doesn't affect patients overall health, but it can be uncomfortable and cause embarrassment. Moreover, it is not contagious, and it's not a sign of poor personal hygiene.

Classification and presentation Seborrheic dermatitis generally affects oily areas of the body as follows: Scalp: The mildest and most common form of scalp seborrheic dermatitis is dandruff, also known as pityriasis sicca (Cradle cap in infants), in which the scalp shows fine, white, diffuse scaliness without underlying erythema. Lesions may extend to the post­ auricular areas where they often develop fissures, oozing, and crusting, and to the outer canal and concha of the ear, sometimes with marked pruritus and superinfection (otitis externa). Face:  Facial…