Contact dermatitis is caused by physical contact of the skin with an irritant such as detergent, soap, chlorine, synthetic fibres, nail polish remover or antiperspirant. Cosmetic and skin-care products are common triggers.
Nummular dermatitis is caused by stress, living in a dry environment or taking very hot showers.
Seborrheic dermatitis or cradle cap has been linked to a deficiency of biotin (one of the B group of vitamins), and with over-production by oil glands. Stress may also play a role in seborrheic dermatitis.
Stasis dermatitis is caused by poor circulation and pooling of the blood in the lower limbs.
Atopic dermatitis is a hereditary allergic condition; other family members often have history of allergy or asthma. It may be triggered by stress, by food allergy (dairy foods and wheat products are common allergens), or by airborne allergens such as pet hair.