Small blisters or blisters on male genitals may be caused by eczema, genital herpes, glansitis and other reasons. 1. Eczema: its occurrence is mainly due to abnormal immune function, environment and other reasons. It often manifests itself as pinhead to corn-grain size papules and papules on the basis of erythema, and in severe cases, small blisters may appear, which are often fused into patches with unclear borders. 2. Genital herpes: caused by herpes simplex virus infection of urogenital and perianal skin mucosa. The skin lesions are mainly manifested as small blisters, clustered or scattered distribution, 2 ~ 4 days after the rupture of the formation of vesicles or shallow ulcers, and then scabs and self-healing. 3. Glans: mainly due to various pathogen infection, external adverse stimuli, trauma and other causes of inflammation of the mucous membrane of the glans. The patient’s foreskin and glans appear red, swollen, painful, itchy discomfort. In severe cases, there can be localized oozing and bleeding of the genitals, and even the occurrence of blisters. In addition, it is recommended that patients with long blisters on the genitals go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying the condition.