<prompt> First PM change in a dead body:-Maggot formationPutrefactionGreenish discoloration of right iliac fossaMummification  <response>: First postmoem change in dead body is greenish discoloration of right iliac fossa Its because of presence of caecum Its first external site of putrefaction Right Iliac Fossa H2S Hb - sulf. Hb - green. 1st internal site - Intima of aoic lumen Reddish brown discoloration Most imp. bacteria involved in putrefaction - Clostridium welchi 