I have a sore on my foot that just doesn't seem to be healing, i think it started as a blister. I'm not sure how long I've had it but i know its been at least 4 weeks. It starts to scab over but then the scab breaks and it becomes an open wound again.The skin around it has made a red circle aswell.
Go to the GP and get it looked at. Have you been tested for diabetes? My friend had a sore on her foot and it just wouldn't heal either and she was tested for type two and had very high blood glucose levels.
Hope it gets better soon but you should go and get it looked at.