My husband has terrible itches on his groin area, scrotum, buttocks, and on his face. He has applied clobestasol, quadriderm etc for a long period of time, seems to heal for some days but comes back. He scratches a lot and now he has dark marks/patches on his buttocks, the skin on the groin area, scrotum is greyish black color and smells horrible. What could be the cause for the itching and black color?? is there any way he can get back his normal skin color on his face, groin area and buttocks?? pls help...