Palpable purpura is caused by
HSP
PAN
Microscopic polyangitis
All of the above
palpable purpura is due to deposition of immune complexes at the site, seen in HSP,Ahritis, gut vasculitis,glomerulonephritis, bacterial endocarditis, gonococcaemia,meningococcaemia and rocky mountain spotted fever. Page no.309. Reference IADVL's concise textbook of dermatology
Autoimmune skin disorders