The cyst on top of the penis is usually a sebaceous cyst, if there is no inflammation and infection, you can continue to observe temporarily without treatment to observe whether the cyst grows. If there is local redness, swelling and pain, because of the occurrence of infection need to be anti-inflammatory treatment, apply erythromycin ointment or Bactroban ointment. Wash with potassium permanganate solution, and after the inflammatory infection is treated, the cyst will become smaller before surgical removal treatment. If there are obvious fluctuations inside the cyst and it is particularly red, it is because the inside is infected with pus and needs to be incised and drained to drain the secretions inside completely. You need to change the medication every day to keep the area clean and dry. Penile cysts are generally benign lesions that can be cured through surgical removal and anti-inflammatory treatment.