sounds familar almost exactly what happened to my mom shes 72 she had a blister ( so she thought) on her back even the sheets hurt it it was the size of a pencil eraser...long story short dr said it was nothing next dr found it was basal cell skin cancer they removed a penny size cirle of skin and it took some time to heal she is fine ,,,skin cancer these days is highly treatable.,,,,,the only other thing I can think of is her not healing could be a staph infection but the docs shoulda noticed that...did they do a cbc?
one more possibility non healing foot wounds are a sign of diabeates in the elderly I dont know about leg wounds just a thought.,
Thank you for the information. She's having the biopsy in two weeks so we'll know more then.
Take care.