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19 Cards in this Set
- Front
- Back
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define chronic urticaria
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recurrent symptoms of pruritic eruptions (urticaria) of more than 6 weeks' duration.
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what causes chonic urticaria?
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autoantibodies IGG (90-95%) or IGE (5-10%) resulting in cross-linking and mast cell degranulation
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How is chronic urticaria treated?
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a non-sedating H1 blocking antihistamine e.g. fexofenadine and removal of urticarial aggravators (eg, stress, alcohol, aspirin, nonsteroidal anti-inflammatory drugs)
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How long does chronic urticaria last?
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Chronic urticaria typically lasts for 1 to 3 years prior to spontaneous resolution
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Define papular urticaria
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Pruritic, erythematous papules arranged in clusters
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What causes papular urticaria?
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delayed hypersensitivity reactions to biting or stinging arthropods
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What age groups suffer from papular urticaria?
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18 mo - 7 years
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treatment of papular urticaria
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treat pet for fleas; insect repellant; protective clothing
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how long does papular urticaria last?
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each crop lasts 2-10 days; recurs for 3-6 months
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acute parapsoriasis - other name
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pityriasis lichenoides et varioliformis acuta [PLEVA]
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what does parapsoriasis look like?
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lesions consist of recurrent crops of red papules that are 2 to 4 mm in diameter and progress to central crusting. some have purpuric centers.
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How is acute parapsoriasis treated?
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oral erythromycin for 1-2 months
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what does Guttate psoriasis look like?
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multiple discrete droplike papules (guttate) progress to papules that have a silvery scale.
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What infection is associated with guttate psoriasis?
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streptococcal infection - patients should be evaluated for pharyngeal or rectal colonization.
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How long does papular polymorphous light eruption last?
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1-7 days
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What shape are patches of hair loss in alopecia areata?
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Round or oval
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What do hairs extracted at edge of area of hair loss look like?
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they demonstrate an attenuated or catagen bulb at the termination of a tapered, poorly pigmented shaft (ie, exclamation point hair).
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What is the prognosis with alopecia areata?
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Spontaneous remission with complete regrowth of the hair within 1 year; 30 % recur and 7% to 10% have chronic disease
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How is alopecia areata treated?
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Reassurance
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