A 3 yo boy presents with reddish-purple rash on his buttocks, thigh, & legs. His mother notes that he has not seemed well since he had cold 2 weeks earlier, he has been c/o aches & pains in his legs & a stomach ache. Urinalysis shows 10-20 RBCs/hpf & 2+ proteinuria. What is the most likely diagnosis? dusty blue colored items to wear for maid of the brides
A. Systemic lupus erythematosus
B. Wegener's granulomatosis
C. Henoch-schonlein purpura
D. Herpes zoster