History: A 22 year old Caucasian male presented with worsening painful rash that started on the lower legs and was spreading for 1 month. At onset of rash, he also had mild bilateral knee pain.
Past Medical History: None Past Medical History: None.
Allergies: No known drug allergies
Family History: Not significant
Medications: Doxycycline 100 mg BID x 1 week
Physical Exam: Palpable purpura on abdomen, upper extremities, and lower extremities (Fig. 1, Fig 2, Fig 3).
Laboratory data: Normal CBC and BMP. UA: 1+ protein and 2+ blood at presentation and subsequent
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