Your history is incomplete. But from what you have described, it appears to be a diabetic leg infection
. You should get to a diabetic foot
surgeon or a general surgeon
with immediate effect who may advice you some tests like complete hemogram, blood sugar(F&PP-2hrs),HbA1C, Doppler USG of both legs(for peripheral vascular disease
) and pus for culture & sensitivity. The only effective therapy in such cases is wound debridement (thorough cleansing of wound and removal of as much dead material as possible) and liberal use of broadest spectrum antibiotics. Also seek advice of your endocrinologist
for tight control of blood sugar levels.