Many cases of dermatitis are the result of allergies. This type of condition is called allergic or contact dermatitis. Some people with dermatitis are sensitive to sunlight. Whatever the irritant, if the skin remains in constant contact with it, the dermatitis is likely to spread and become more severe. Stress, especially chronic tension, can cause or exacerbate dermatitis.
Atopic dermatitis is a hereditary form of the condition that usually becomes apparent in infancy.
It typically appears on the face, in the bends of the elbows, and behind the knees. Often, other family members have histories of allergies or asthma. It may be caused by an allergy to nickel, and is often associated with dry skin. Dermatitis herpetiformis is a very itchy type of dermatitis associated with intestinal and immune disorders. Eczema is a term sometimes used interchangeably with dermatitis, although some authorities define it as a specific type of dermatitis distinguished by the presence of fluid-filled blisters that weep, ooze, and crust over.