The causes of pinpoint-sized blisters without ulcers on the genitals include genital herpes, fungal infections and other causes. 1. Genital herpes: related to the infection of herpes virus, most appear in the patient’s immunity is low, coupled with personal hygiene is not in place due to, can be infected through sexual life. Patients can follow the doctor’s instructions to apply ganciclovir ointment, acyclovir cream and other treatment. At the same time with oral vasiclovir, acyclovir cream. 2. Fungal infections: related to dermatophyte infections, some patients may be manifested as yellow-white pustules on the genitals, patients can follow the doctor’s instructions to apply ketoconazole, miconazole nitrate cream and so on for treatment. Patients need to go to the hospital for treatment, the application of drugs need to strictly follow the doctor’s instructions.