62 years old 5'6 180lbs pad hart bypas for about 5 years I get a crusty like skin on the ring around my penus. I asked doctor and she just gave me a talk powder What could this be. is it a std? wife has nothing like this and we have sex often.there is no itching or burnung at all.Sexual intercorse rubs off the lite scaly and leaves just red skin. Any Idea at all and what should I do. I use foot powder spray that seems to be the best on it