(2) affects the perianal area, buttocks, groin and trunk more than the extremities or head
(3) attacks last a few hours or days with recurrences over an extended period
The rash progresses very rapidly. It may progress 5-10 cm per day and can sometimes be seen to advance perceptibly while under observation. In contrast, the rash in cutaneous larval migrans advances only 1-2 cm per day.
A skin biopsy is often negative and the stool examination for parasites may be negative.
If the patient has the clinical features and a history of travel or residence in a high risk area for strongyloidiasis, then treatment for strongyloidiasis should be considered.
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