I have a burn on my penis?

Depending on depth : If it is very superficial treatment should be aimed at preventing an infection. That can usually be done with neosporin small amout (if not allergic), applied to burn area and then apply and leave on a sterile gauze pad. Change twice a day til all skin is healed and intact. If not very superficial then see a doctor asap for further instructions

How deep: The depth is impt. Superficial burns most likely can be treated with local hygiene soap water and antibiotic ointment. Keep secondary dressing in place. If deeper see a burn surgeon. Check your tetanus status.