| dermatitis, irritant | A non-allergic contact dermatitis caused by prolonged exposure to irritants and not explained by delayed hypersensitivity mechanisms. (12 Dec 1998) |
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| dermatitis medicamentosa | drug eruption |
| dermatitis multiformis | A chronic disease of the skin characterised by severe itching, extensive eruption of vesicles (blisters) and papules which occur in groups. May be associated with an occult malignancy in the elderly patient. Treatment includes sulpha-based antibiotics. In some cases this condition may be associated with malabsorption. Relapses are common. (27 Sep 1997) |
| dermatitis nodosa | A papular eruption on the legs, related to craw-craw. (05 Mar 2000) |
| dermatitis nodularis necrotica | A recurrent eruption of vesicles, papules, and papulonecrotic lesions on the buttocks and extensor surfaces of the extremities, accompanied by fever, sore throat, diarrhoea, and eosinophilia; probably a variant of vasculitis, it can be of varying and increasing severity and duration, and can occasionally involve the heart, kidneys, and gastrointestinal tract. Synonym: Werther's disease. (05 Mar 2000) |
| dermatitis, occupational | A recurrent contact dermatitis caused by substances found in the work place. (12 Dec 1998) |
| dermatitis papillaris capillitii | A type of acneiform disorder in which secondary pyogenic infection in and around pilosebaceous structures ends in keloidal scarring. It manifests as persistent folliculitis of the back of the neck associated with occlusion of the follicular orifices. It is most often encountered in black or asian men. (12 Dec 1998) |
| dermatitis pediculoides ventricosus | Straw-bed itch, an urticarial eruption caused by the mite, Pyemotes ventricosus, which can infest straw used in mattresses. Synonym: dermatitis pediculoides ventricosus. (05 Mar 2000) |
| dermatitis, perioral | A papular eruption of unknown aetiology that progresses to residual papular erythema and scaling usually confined to the area of the mouth, and almost exclusively occurring in young women. It may also be localised or extend to involve the eyelids and adjacent glabella area of the forehead (periocular dermatitis). (12 Dec 1998) |
| dermatitis, photoallergic | A delayed hypersensitivity involving the reaction between sunlight or other radiant energy source and a chemical substance to which the individual has been previously exposed and sensitised. It manifests as a papulovesicular, eczematous, or exudative dermatitis occurring chiefly on the light-exposed areas of the skin. (12 Dec 1998) |
| dermatitis, phototoxic | A nonimmunologic, chemically induced type of photosensitivity producing a sometimes vesiculating dermatitis. It results in hyperpigmentation and desquamation of the light-exposed areas of the skin. (12 Dec 1998) |
| dermatitis repens | pustulosis palmaris et plantaris |
| dermatitis, seborrheic | A chronic inflammatory disease of the skin of unknown aetiology. It is characterised by moderate erythema, dry, moist, or greasy scaling, and yellow crusted patches on various areas, especially the scalp. On the scalp, it generally appears first as small patches of scales, progressing to involve the entire scalp with exfoliation of excessive amounts of dry scales (dandruff). (12 Dec 1998) |
| dermatitis simplex | Blushing or redness of the skin caused by a toxic reaction or a neurovascular phenomenon. Synonym: dermatitis simplex. (05 Mar 2000) |
| dermatitis, toxicodendron | An allergic contact dermatitis caused by exposure to plants of the genus toxicodendron (formerly rhus). These include poison ivy, poison oak, and poison sumac, all plants that contain the substance urushiol, a potent skin sensitizing agent. (12 Dec 1998) |