White eruption on the penis may be caused by factors such as prepuce glans, genital herpes, penile cancer and so on. 1. circumcision and glansitis: poor hygiene for a long time may induce circumcision and glansitis, which makes the local presence of bacterial or fungal infection in the penis, and when the infection is serious, it will make white erosion material appear in the penis. 2. Genital herpes: usually associated with unclean sex, it may cause small blisters to appear locally on the penis, which will gradually break down and erupt, accompanied by tingling and itching. 3. Penile cancer: it may be related to repeated infections, bad life habits and other factors, which may cause localized swelling on the penis, which may break down and erupt, and in serious cases, it may also metastasize to distant places. White ulcers on the penis with obvious discomfort symptoms should be alerted to the above lesions, and it is recommended to consult a doctor for examination and treatment.