<prompt> Pyoderma gangrenosum is seen in a Crohms diseaseb Divertuculosisc Ulcerative colitisd Ca. colonaacadb  <response>: Pyoderma gangrenosum is characterized by rapidly spreading ulcer with erythematous, infiltrated border on thighs and abdomen. It is associated with several internal diseases such as ulcerative colitis, Crohns disease, biliary cirrhosis, SLE, RA, CML. 