A circle of small bumps on the glans may be the result of diseases such as pearly penile papules, condyloma acuminatum and genital herpes. 1. Pearly penile papules: pearly penile papules is a skin disease characterized by pearly, translucent papules appearing on the coronal edge of the penis and the coronal sulcus. Patients may manifest as a circle of small bumps on the glans. Its etiology may be related to physiological developmental variations, local irritation and other factors. 2. Condyloma acuminatum: Condyloma acuminatum is caused by human papillomavirus infection, if you have more than one sexual partner, no safety measures of sexual behavior may be induced condyloma acuminatum. The patient can appear in the glans area reddish color small particles, pimples, manifested as a circle of small bumps on the glans. 3. Genital herpes: Causes include herpes simplex virus infection, low immunity, and overwork. Patients manifested as small blisters on the genitals, accompanied by itching, pain and other symptoms, appearing as a circle of small bumps on the glans. There are many reasons for the appearance of a circle of small bumps on the glans, such as allergies, circumcision or other skin diseases, it is recommended that the patient to clarify the cause of the disease, and active treatment.