<prompt> Palpable purpura is caused byHSPPANMicroscopic polyangitisAll of the above  <response>: 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 IADVLs concise textbook of dermatology 