Which of the following is not a effect of gas formation in putrefaction?

Blood tinged froth exudes from nostrils and mouth (i.e. postmoem purge) due to presence of gas in abdomen Blisters in thigh are termed as postmoem blisters which are also due to gas formation. Rigidity : abduction and flexion of the limbs occurs due to inflation of the tissue with gases. Anus & uterus may prolapse due to gas formation and postmoem delivery of a fetus takes place.