Talk to Gynecologist on Fistula Problem

Meri sister k vagina py daana tha jis me sy puss to nikalti thi sath gass b discharge hoti thi.. unko Fistula Diagnose hua tha.. jis ki Surgery b huy 2 weeks ho chuky.. stiches nahi lgy kyun k zakham khud hi heal hona tha.. Zakham ab heal to hona start hogya hai masla wohi hai gass discharge hony wala.. usi surgeon ko dubara check krwaya after 2 weeks.. he said apparently to koi masla nahi.. ap zakham ko mukamal heal hony den. Ab dar ye hai k zakham heal hony k bad masla agr wohi raha to dubara surgery ka naa keh den. Ya phr jub zakham bhar jay ga to gass wala masla b hal hojay??