Thank you for the query.
This leakage is most likely caused by wound infection
indeed. It may be caused by bacteria presence, irritation due to stitches presence, lost stone in the wound. The fluid can also appear due to incomplete abdominal cavity closure, or presence a part of perineum
in the wound region.
I suggest you to visit your surgeon sooner. It is because infection may spread to the surrounding tissues, the infection can cause poor tissues healing and result with hernia
in this area.
The wound needs to be checked by surgeon, drained if necessary. Antibiotics might be necessary as well.
Hope this will help.