Itchy perineum in men can be caused by physiological reasons such as friction, and pathologic reasons such as penile glans or scrotal inflammation. 1. Physiological reasons: running or clothes are too tight, resulting in friction, which can lead to inflammation of the outer dermis and tiny gaps, resulting in burning or itching of the skin. 2. Pathologic causes: (1) If it is scrotal itching may be usually do not pay attention to personal hygiene, the scrotum has a large number of hair follicles are easy to secrete sweat, if the pores are clogged easy to breed bacteria caused by scrotal inflammation. (2) If the glans itching may also be caused by glansitis, long-term attention to hygiene or unclean sex caused by bacterial germs invasion, caused by glansitis. Male perineum itching can also be seen in other diseases, it is recommended to go to a professional urology department to do the relevant examination, to find out the cause of the disease under the guidance of the doctor targeted treatment.