I have dark patches or spots inside my penis, its look so bad, sometimes my wife asked that why my penis skin has dark patches. I told her I dont know. I want to tell you how it comes, it is come by mastrubate and sometimes I put some colgate powder inside my penis head, I dont know that time it could create problem. That time I was 17 years old. Please help me to remove the dark patches. Suggest me some creame to sortout this problem.