For itchy penile skin, further examination is recommended to clarify the cause. It may be due to the following reasons: 1. Suffering from circumcision, such as bacterial, fungal and other infections, can cause itching of the skin or skin lesions in the corresponding areas, such as the appearance of skin redness, swelling, erosion and other changes, and may be accompanied by abnormal urination or accompanied by local tissue swelling, etc.. It is recommended that a smear examination of the relevant secretions, such as a bacterial smear or fungal smear, be performed to clarify whether there is a bacterial or fungal infection. 2. Sexually transmitted diseases, such as unclean sexual contact, infection with mycoplasma, chlamydia, gonococcus, etc., can cause itching of the skin, usually accompanied by increased secretions in the urethra, urinary frequency, urinary urgency and other urinary tract irritation symptoms. If there is a clear history of unclean sexual contact, it is recommended that the relevant examination of sexually transmitted diseases be carried out to clarify whether there are associated transmission diseases. 3, local dermatological diseases, such as local allergies, can lead to itchy skin, generally for contact allergies or oral allergic drugs, etc., can be accompanied by the same lesions in other parts of the body or with itchy skin and other symptoms, the need for allergen testing to further confirm the diagnosis.