Bulging between the anus and urethra. It may be caused by the following conditions: 1. The posterior vaginal wall bulge is seen in female patients after childbirth, which is due to excessive tension in the perineum during childbirth or assisted delivery, causing damage to the fascia and rectal muscle wall, and requires more anal lifting exercises to help relieve it. 2. It may be caused by a perianal abscess, mostly due to a local bacterial infection resulting in a septic reaction, which may result in a local bulge, painful to press and hard to touch,