urticaria pigmentosa

urticaria /ur·ti·ca·ria/ (ur″tĭ-kar´e-ah) hives; a vascular reaction of the upper dermis marked by transient appearance of slightly elevated patches (wheals) which are redder or paler than the surrounding skin and often attended by severe itching; the exciting cause may be certain foods or drugs, infection, or emotional stress.urticar´ial

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urticaria bullo´sa , bullous urticaria that in which bullae are superimposed on the wheals.

cold urticaria  urticaria precipitated by cold air, water, or objects, occurring in a hereditary and an acquired form.

giant urticaria  angioedema.

urticaria medicamento´sa  that due to use of a drug.

papular urticaria  a hypersensitivity reaction to insect bites, manifested by crops of small papules and wheals, which may become infected or lichenified because of rubbing and excoriation.

urticaria pigmento´sa  the most common form of mastocytosis, characterized by small, reddish brown macules or papules that occur mainly on the trunk and tend to urtication upon mild mechanical trauma or chemical irritation.

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urticaria pig·men·to·sa (pgmn-ts)

n.

Mastocytosis resulting from congenital excess of mast cells in the superficial dermis and characterized by brownish papules that urticate when stroked.

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urticaria pigmentosa,

an uncommon form of mastocytosis characterized by pigmented skin lesions that usually begin in infancy and become urticarial on mechanical or chemical irritation. Although duration of the condition is unpredictable, prognosis is good. Treatment is symptomatic and usually includes antihistamines for relief of itching. See also mastocytosis.

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urticaria

a vascular reaction of the skin that is commonly immunologically based or may be due to direct exposure to a chemical. Marked by transient appearance of slightly elevated patches (wheals) which are redder or paler than the surrounding skin and often attended by severe itching; called also hives. The wheals may be in very large numbers, mostly over the body, 0.5 to 2 inches in diameter and there is no discontinuity of the epithelium. Called also nettle rash.

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giant urticaria, urticaria gigantea

angioneurotic edema.

heat reflex urticaria

see cholinergic pruritus.

urticaria hemorrhagica

purpura with urticaria.

urticaria medicamentosa

that due to use of a drug.

nasolacrimal urticaria

conjunctivitis and rhinitis caused by hypersensitivity to inhaled allergens (atopy).

papular urticaria, urticaria papulosa

an allergic reaction to the bite of various insects, with appearance of lesions that evolve into inflammatory, increasingly hard, red or brownish, persistent papules. See also lichen.

urticaria pigmentosa

a proliferative disorder of mast cells in humans; a similar disease has been reported in young cats. There is erythema and hyperpigmentation of the mouth, chin, neck and eyes.

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urticaria pigmentosa

Dermatology An idiopathic self-limiting benign condition characterized by light brown skin lesions, intense itching, and hives at the site of rubbed lesions; affected children develop by age 2 lesions containing mast cells which produce histamine and cause the typical skin response–rubbed lesions rapidly develop a wheal and systemic Sx–flushing, headache, diarrhea, tachycardia, fainting; younger children may develop a fluid-filled blister over a traumatized lesion; UP often disappears by puberty. See Histamine, Mastocytosis.