Since last 2 months, under my feet, the skin becomes Hard and then cracks appear (sometimes deep). Then the Hard Outer Skin turns dark black. This happens UNDER the feet, so not visible in slippers. I am Not Diabetic. My sugar level always stays within the range (for non-diabetic people). And I also do Not have BP. I sometimes use Exsora (Nulife Pharma) and Pasitrex C (Sun Pharma) after dipping my feet in Hot Water. First Exsora for 2-3 hrs, then Pasitrex C for 2-3 hrs. This gives Relief.