Repeated ulcers on the glans corona can be considered to have diseases such as genital herpes, glans circumcision, syphilis or Behçet’s disease. 1. Genital herpes: caused by herpes simplex virus infection, lesions may first appear as small blisters, and then break down to form vesicles or shallow ulcers. 2. Glandulitis: due to the long foreskin, local cleaning is not good when the formation of foreskin scale, can appear glandulitis, serious cases can cause the penis head, the inner plate of the foreskin has red, swollen, congestion, ulcers and other manifestations. 3. Syphilis: due to unclean sex, men can form painless ulcers in the coronal groove of the penis, glans, prepuce and other parts of the penis, with clear boundaries, and the periphery can be edematous and elevated. 4. Behçet’s disease: also known as leukoaraiosis, there are oral and vulvar ulcers, which are more common in the scrotum and penile area in men. When repeated ulcers appear on the glans penis, it is recommended to seek timely medical examination and take appropriate treatment measures according to the cause of the disease.