Ask dermatologist: PR often persists 2 or even 3 months. There is no confirmatory biopsy, lab test, or culture, so we always keep in mind that we can be fooled. Parovirus B19 causes a similar rash in adults. If it lasts more than 3 months, if it is on your face or hands, a different diagnosis must be entertained. In the past it was routine to do a syphilis test but that diagnosis has become unusual except in gay men
Answered 8/2/2016
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