is a vascular skin reaction characterized by eruption of
wheals on the skin which are pruritic. These are
smooth,slightly elevated red patches with well defined
margins and pale centers.
Evolves rapidly, and usually has a detectable cause.
e.g. hypersensitivity to certain foods, drugs, insect bites, emotional stress.
The lesions subside within 12-24 hours, but new crops of lesions may erupt continuously, thus prolonging the attack.
It lasts longer than 6 weeks and the lesions may recur for months or years and usually the causative factor is not known. But aspirin frequently exacerbates this problem.
Aspirin, penicillin, NSAIDS, ACE inhibitors , radiographic dyes
Nuts, chocolate, shell fish, Food additives in soft drinks, Jellies, custard, sauces, yeast, bread, sausages, wines,
III Rubbing or putting pressure on the skin.
IV Exposure to sunlight.
Tonsils, sinuses, upper respiratory tract.
1. Detailed history regarding food and drugs, exposure to environmental factors etc.
2. Avoid the causative factor
3. Treatment of acute attack
1. Oral antihistamines 2. Corticosteroids 3. Subcutaneous epinephrine
Injection [when there is laryngeal edema]