Urticaria

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urticaria

[‚ərd·ə′kar·ē·ə]
(medicine)
Hives or nettle rash; a skin condition characterized by the appearance of intensely itching wheals or welts with elevated, usually white centers and a surrounding area of erythema. Also known as hives.

Urticaria

 

nettle rash, an allergic reaction characterized by the sudden and rapid appearance on the skin (sometimes also on the laryngeal mucosa) of intensely itching wheals.

Urticaria is often caused by the sting of the nettle and certain other plants. Insect bites, temperature, and chemical agents are also among its causes. Other factors include parasitic worms, chronic constipation, liver and kidney diseases, and allergic sensitivity to some foods (for example, strawberries, citrus fruits, eggs, mushrooms, preserves, certain fish, pork, and chocolate). Urticaria is sometimes caused by hypersensitivity to drugs (especially to those of chemical origin). The rash associated with the condition is a manifestation of the inflammatory reaction and edema of the skin that result from a sudden increase in the permeability of the capillaries in the area. This results from the liberation of histamine from the mast cells of the skin by allergic alteration. Urticaria usually disappears without a trace within a few hours, although it sometimes recurs. It is treated by purgation (by enemas, laxatives), special diet (mostly milk and vegetables, with limited salt intake), and desensitizing and anti-histaminic agents.

REFERENCE

Pavlov, S. T. Kozhnye i venericheskie bolezni, 2nd ed. Moscow, 1969.

R. S. BABAIANTS

References in periodicals archive ?
Insect bite-induced hypersensitivity and the SCRATCH principles: a new approach to papular urticaria. Pediatrics.
El Nino has been associated with increases in the occurrence of actinic keratosis, tinea, pityriasis versicolor, miliaria, folliculitis, rosacea, dermatitis caused by Paederus irritans and Paederus sabaeus, and certain vector-borne and waterborne diseases (such as dengue fever, leishmaniasis, Chagas disease, Barmah Forest virus, and leptospirosis), and with decreases in the occurrence of dermatitis, scabies, psoriasis, and papular urticaria. La Nina has been associated with increases in the occurrence of varicella; hand, foot, and mouth disease; and Ross River virus (in certain areas), and decreases in viral warts and leishmaniasis.
Most common non-infectious disorders were pruritic papular eruption and papular urticaria followed by pitriasis alba, aphthous stomatitis and seborrheic dermatitis [Figure 6] equally.
Non-infectious diseases constitute the rest of the manifestations (43.7%) with Pruritic papular eruption and papular urticaria being the most common (28.5%) with a mean CD4 count of 440.5 cells/cumm and 390 cells/cumm respectively.