Penile erosion may be associated with glans penis, genital herpes, soft chancre and syphilis. 1. Circumcision: If a man is circumcised and has a long foreskin, a localized trichomonas, bacterial or fungal infection of the penis may occur, which, when particularly severe, may lead to penile erosion, often accompanied by a foul odor. 2. Genital herpes: often associated with herpes simplex virus infection, resulting in small blisters on the genital area, which may gradually break down and erupt, and may be accompanied by pain, ulcers or increased body temperature. 3. Noma: often associated with Haemophilus ducreyi infection, it is a sexually transmitted disease that causes pustules to appear on the local skin of the penis, which gradually break down to form ulcers and have a strong odor. 4. Syphilis: often associated with syphilis spirochete infection, mostly transmitted by sexual contact, when invaded by the penis can make it appear superficial ulcers, and will gradually erosion. In addition, penile erosion is also related to many diseases, such as leukemia, sclerosing atrophic moss, erosive glans. If a man develops penile erosion, he should seek medical attention as soon as possible to identify the cause and treat it.