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19 Cards in this Set

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