Small blisters on male genitals may be caused by diseases such as glans phimosis, genital eczema and genital herpes. 1. Foreskin glansitis: Foreskin glansitis is an inflammation of the foreskin, glans where a localized infection occurs, its main manifestation is the redness and swelling of the foreskin glans, burning pain, such as turning the foreskin, the foreskin and glans can be seen in the inner plate and glans congestion, swelling, rashes, blisters, and the heaviest can be ulcers, vesicles, and so on. 2. Genital eczema: genital eczema occurs on the vulva, penis, scrotum and other parts of the body, and its clinical manifestations are mainly characterized by skin erythema, papules, blisters and so on, accompanied by itching and other symptoms, male genital blisters may be caused by male genital eczema. 3. genital herpes: genital herpes is a common sexually transmitted disease, mainly caused by herpes simplex virus infection of urogenital and perianal skin mucosa, most patients with genital herpes do not have obvious conscious symptoms, the symptomatic person is mainly manifested as blisters, vesicles, or ulcers around the genitals, accompanied by itching, burning sensation, pain and other symptoms. It is recommended that the patient timely medical examination, clear causes for targeted treatment, pay attention to personal hygiene in life, keep private clean and dry, avoid scratching the affected skin, so as to avoid scratching the skin secondary infection and so on.