How do I heal severe abrasions on penis?

Depends. Knowing how you injured the penis and the extent of damage would be helpful. If deep abrasions or concern for loss of tissue or infection, get seen right away. Otherwise, good soap and water treatment and topical antibiotics and "rest" and give it time to heal. If there is any question of more than superficial infection, see a doctor right away. Do u need tetanus shot? Severe spread can occur!