Red pimples on the glans may be caused by diseases such as pearly penile papules, glansitis, condyloma acuminatum and so on. 1. pearly penile papules: pearly penile papules are mostly caused by physiological variations, local irritation and other factors, patients with long foreskin or poor personal hygiene can also induce this disease, the patient’s glans will appear on the reddish translucent pimples, manifested as red small pimples. 2. glansitis: glansitis may be caused by pathogen infection, such as staphylococcus aureus, anaerobic bacteria, trichomonas vaginalis, etc., but also may be caused by allergic reactions, urinary stimulation, etc., glans due to inflammatory reaction, there will be localized erythema, blisters, and other symptoms, which will also be manifested as red pimples. 3. acromegaly: acromegaly is a sexually transmitted disease, mainly caused by human papillomavirus infection, can be spread through sexual contact infection, multiple sexual partners, unsafe sexual behavior and other factors will also induce this disease, the patient’s glans area may appear reddish small particles, manifested as red pimples. There are many reasons for red pimples on the glans, which may also be caused by other factors. It is recommended that the patient be admitted to the hospital for examination and treatment after clarifying the cause of the disease, and attention should be paid to personal hygiene in normal times.