After intercourse found small blisters on the penis, can consider the appearance of pearly penile papules, genital herpes, or the circumcision glansitis and other conditions. 1. pearly penile papules: may be due to circumcision and local long-term not pay attention to clean, can be presented in the glans coronal groove of the glans in a row or several rows shaped like a small pearl, the surface of the smooth white or reddish papules or granular hyperplasia, and sometimes can be around the coronal groove. 2. Genital herpes: caused by herpes simplex virus infection, mainly through sexual contact transmission, men preferred in the foreskin, glans, etc., patients have clusters or scattered small blisters, 2 to 4 days after the breakthrough to form shallow ulcers or vesicles, scabs, self-healing. 3. PAPPICULAR TORNAMITIS: The allergic reaction caused by drugs in the genitals, insufficient local cleansing or pathogen infection can cause PAPPICULAR TORNAMITIS, with pain, redness and swelling of the foreskin and glans, and sometimes it can cause glans itching and rash, and in severe cases, it can cause vesiculation, ulceration, or hemorrhagic manifestations. Unexplained small blisters appear on the penis, it is recommended to go to the hospital specialist in time, and follow the doctor’s instructions for treatment.