Diagnosis of boil. Please advise.

Hi Doctor In last Nov in my right thigh I got small lymph and gradually it increases in size and then started reddish on skin and after that discharge starts. I had consult with doctor they told me this is chronic sinus and operated. After six month later it again started discharging from same place. This time I went to RML hospital Delhi in dermatology department they were saying it is pyoderma. Now I have 2 more boils near old boil which was operated. I am using megaheal and metrogyl tube on wound and with this discharge stops and wound closed with black spot. Sometimes it start again and same way I used to cure. Even after wound filling a small plate type lymph I feel inside the skin. I want permanent solution for this. Is it possible to cure it or operation needed again. Should I consult with surgeon or It is a skin disease than is curable in dermatology. Please advise. Thank you.