Welcome to heathcare Magic!
You are having very aggressive local infections. The black dots may be necrosis
tissues, bacteria or fungus.
There is no scope of medical or trial treatments because you can develop sepsis
if left untreated.
You need surgical removal of the infected tissue.
Removal of sweat glands does not cause any problem.
You can get the varicose
repaired in the same sitting to save time and cost.
But first of all you should visit and get examined by an experienced surgeon and get a physical examination.
Wish you a great health!