A 16 year old female was given penicillin for an apparent "Strep throat".She soon developed a reddish-appearing skin rash,which was firm when palpated.A biopsy was performed.A representative section of the biopsy is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

Question

Quizplus · Accepted Answer

The patient has "palpable purpura" caused by an allergic immune reaction to penicillin,which can be inferred by the proximity to the penicillin dosEThis has caused the histological finding known as leukocytoclastic vasculitis,evident in the photomicrograph.It is also known as microscopic polyarteritis,because the vessels involved are usually small,dermal vessels.

A 16 Year Old Female Was Given Penicillin for an Apparent