Hello ,
Yes the reappearing is possible unless causative factor is treated properly.
Most of the gangrene causes are
Diabetes
Atherosclerosis
Smoking
Obesity etc.,
So if above causes are treated or under control the reappearing is less.
Wound healing also plays an important role so if the wound healing is proper then risks are less, to prevent reappearing check if there is any blood supply blockage left and treat accordingly, Antibiotics taken properly as prescribed by the physician.
If diabetic try to keep the blood
sugar levels under control, quit smoking.
Next Steps
Regular blood
sugar check ups and try to keep them under control, quit smoking, loose weight if obese,
Balanced diet is also important, which improves in healing and building immune system.