Got your pain n concern though it's unfortunate but in such scenario whole status of health n fitness need to screened it could be varicose veins ulcer or diabetic non healing ulcer.
Ayurveda offers amazing outcome with bit of detox and internal medicine along with wound care dressings like turmeric, camper or nimb/Jatyadi thailam
Health Tips
Hopefully you are taking care of wound with your dr.
use dry Turmeric powder for dressing...along with basic cleaning by normal saline n hydrogen peroxide....
Reduce curd n salt in ur diet and add bit of walking to boost blood circulation