You are probably having a cold abscess ( tubercular abscess
Try to get a sputum sample examined for tuberculosis
The pus draining from the incision site can also be examined.
If there are any swellings in your neck ( lymph
nodes ) FNAC can be done to detect changes suggestive of tuberculosis.
Also get tested for Diabetes
and HIV infection.
Feel at ease as Tuberculosis is completely curable with proper dosage drugs taken regularly for the appropriate duration