A rash that occurs on penis skin can be a relatively harmless thing particularly if the rash is truly a rash and not an open sore or bump; is relatively painless and begins to disappear after a few days. However, a penile rash depending on its nature can require medical treatment but the majority of rashes come from frequent self-gratification, aggressive sex or rough, even tight, clothing and allergies and often can be treated at home using a penis health creme which will help protect against many of the more innocent causes of a penis rash.