There are more reasons for teenagers to have sores on the penis, such as the more common sexually transmitted diseases such as condyloma acuminatum, syphilis, genital herpes, and possibly bacterial or fungal infections, etc., which need to be further perfected and examined in order to clarify the condition. 1. Condyloma acuminatum: it is caused by human papilloma virus infection, belongs to a kind of sexually transmitted diseases, mostly have unclean sex history. It can be manifested as pimples, erythema, and papillae and cauliflower-like growths at the penis, which can look like sores when broken. 2. Syphilis: Syphilis is also a kind of STD, which is caused by the infection of syphilis spirochete. It can manifest as papules and hard nodules on the genitals, and some of them can manifest as painless ulcers. 3. Genital herpes: It is caused by herpes simplex virus infection, which can be sexually transmitted and is caused by herpes simplex virus infection. It can be manifested as pimples or blisters on the penis, and ulcers can be formed after the blisters burst, which are often itchy or painful. 4. Bacterial or fungal infections: Bacterial infections of the skin of the penis can be manifested as localized redness, swelling, heat and pain, and some of them can become pus, with pus secretions flowing out. Fungal infections can lead to red spots, pimples or small blisters on the penile skin, and blisters can break down to form sore-like changes. Teenage penile sores may also be caused by other reasons, it is recommended that patients go to the regular hospital, complete the auxiliary examination, in order to clarify the cause of the cause of the disease by a professional physician for the cause of the appropriate treatment.