It may be surprising for some people but there are men who do develop pimples on their penis. Acne can form on any portion of the skin. If the portion becomes too oily or becomes a breeding ground for bacteria, that will already be enough for them. When you develop acne on your penis, it will help if you could make the effort to keep it clean. It will not form pimples for no reason.
You need to wear clean underwear all the time. You may also have to refrain from wearing clothes that are too tight or you may end up having more pimples not only on your penis but the other parts of your lower body.
Acne is pimples that develop on the surface of the skin. It usually occurs due to the skin being too oily. This oil gets trapped into the pores of the skin and remains there. Then a bump or two forms due to this oiliness. Acne can develop anywhere on the skin. Of course, it can’t build on the eyes or inside the body because it does not contain skin. Otherwise, acne can develop on the face, back and other parts of the body including the penis.
However, the best way to keep skin from being acne-free, then the person should keep that body part extra clean. Oiliness is the problem with it. Make sure these areas are clean and dry during most of the time.