Contact dermatitis could be a term for a skin reaction (dermatitis) ensuing from exposure to allergens (allergic contact dermatitis) or irritants (irritant contact dermatitis). Phototoxic eczema happens once the substance or pain in the ass is activated by daylight. Dermatitis could be a localized rash or irritation of the skin caused by contact with a distant substance. Solely the superficial regions of the skin are affected connected eczema. Inflammation of the affected tissue is gift within the cuticle (the outer layer of skin) and therefore the outer corium (the layer below the epidermis) in contrast to contact hypersensitivity reaction, during which a rash seems inside minutes of exposure and fades away inside minutes to hours, dermatitis takes days to dissolve.