Seborrhoeic dermatitis is an inflammatory scaly condition primarily affecting the face and scalp.
The affected areas of the face are primarily the oily areas (rich in sebaceous glands) on either side of the nose, the nostril folds, the nasolabial folds, the area between the eyebrows and the eyebrows themselves, and the external ear canals. The scalp is the primary area where the disease is found and it triggers inflammatory dandruff that extends beyond the scalp. Other hairy areas may be affected such as the eyelids (causing blepharitis) and the pubis, as well as the beard or chest region in men.