Sores on the glans may be caused by genital herpes, inflammation, sexually transmitted diseases and so on. 1. Genital herpes: usually caused by herpes simplex virus, patients will appear in the genital area of red spots, blisters, etc., and will be accompanied by pain. 2. glansitis: glansitis is mainly an inflammation of the mucous membrane of the glans, which may be caused by local infection, irritation and other factors. Patients are mainly characterized by edematous erythema, erosion, oozing or dryness and flaking of the glans and foreskin. 3. Sexually transmitted diseases: such as condyloma acuminatum or syphilis, etc., mainly related to the patient’s unclean sexual behavior, the patient may appear in the glans, penis, foreskin and other parts of the small erythema, syphilis patients can gradually appear in the late syphilitic rash, which is characterized by red or reddish-brown pimples, maculopapular rash and so on. Sores on the glans may also be caused by other diseases, but generally associated with poor local hygiene or poor sexual behavior, it is recommended to pay attention to daily hygiene, there are uncomfortable symptoms in time to consult a doctor.