It’s most likely Vitiligo. Does he have white patches on other parts of his body like elbow, knees, hands? These are common areas for the patches to show up. On the penis also.
User Detail :
Name : Jeff31166, Gender : M, Sexual Orientation : Straight, Race : White/Caucasian, Religion : Atheist, Age : 45, City : Victoria, State : NA, Country : Canada, Occupation : Graphic Designer - Art director, Education level : 2 Years of College, Social class : Middle class,