skin rash and joint pain | Figure 1

Anishadua

Skin Rash and Joint Pain

A 35 year old male presents with atraumatic pain and swelling of the L ankle along with the pictured rash that affects his B legs and buttock area. He is on no medications and has no prior medical history. About 2 weeks ago he had abdominal pain and some diarrhea which self resolved. What is the diagnosis and what test should be ordered?

Diagnosis added by author
IgAV

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