I think I know what you're talking about it is what happened to my husband. What you need to do is to take a wide nail filer and exfoliate the black areas(while your skin is dry). Then you rinse and dry and apply vitamin E oil. All it is is dryness. Dead skin that has accumulated throughout the years keep them moisturized and you'll be shocked. Then try to find a mexican bar soap called Concha Nacar, Mother of Pearl, Apply to dark areas of any part of your skin. Leave on for a minute(lathered). Then rinse. God bless you

