Infection after hernia surgery. This.

Had umbilical hernia surgery with 15 x 15 cm mesh. Recovered fully. But after 2 months of surgery burning sensation around the mesh then after some days serous fluid used to come out it has been 7 months from surgery still the serous fluid is coming out. Serous fluid is around 3-4 ml in a day. Ultrasound report : Sinus tract upto mesh in the superficial plane. The tract measures 8mm thickness and 17mm in depth. The mesh appears normal. Umbilical region show inflamed soft tissue around the mesh and minimal fluid collection. Mesh Granuloma. Fluid culture report: No growth after 48 hrs of aerobic incubation at 37 degree centigrade. Question: It has been 7 months from surgery still the fluid is coming out (3-4 ml in a day) what could be the option to cure this.