<unk>  is a term for  a skin reaction  resulting from exposure to allergens (allergic<unk>  or irritants (irritant<unk> .Phototoxic dermatitis occurs when the allergen or irritant is activated by sunlight.<unk>  is a localized rash or irritation of the skin caused by contact with a foreign substance. Only the superficial regions of the skin are affected in<unk> . Inflammation of the affected tissue is present in the epidermis (the outermost layer of skin) and the outer dermis (the layer beneath the epidermis). Unlike contact urticaria, in which a rash appears within minutes of exposure and fades away within minutes to hours,<unk>  takes days to fade away. Even then,<unk>  fades only if the skin no longer comes in contact with the allergen or irritant.<unk>  results in large, burning, and itchy rashes, and these can take anywhere from several days to weeks to heal. Chronic<unk>  can develop when the removal of the offending agent no longer provides expected relief.
Contact Dermatitis
Eczema
Contact dermatitis
Herpes Simplex Keratitis
Nummular dermatitis
Paederus dermatitis
Xerotic eczema
Phytophotodermatitis