Penis sores are usually a sign of an underlying infection or other condition that needs treatment. What's Causing This Sore on My Penis?.
Rubbing very hard on your penis — whether during sex or masturbation — can create or swollen testicles; itching or irritation inside your penis; sores on your penis, rectum, or mouth . Why Is There a Scab on My Penis?.
Non-STD lesions on the penis include the common condition of folliculitis, which is a bacterial infection of a hair follicle, usually caused by friction or irritation. Painful, tiny clusters of small blisters may indicate genital herpes. Other ulcers or sores on the penis, whether.