Hello there. I have read through your question and understand your concern. A mild cut or tear on the shaft of the penis usually heals by itself. But since it is a sensitive area and more prone friction, it may sometimes get infected and delay the healing process. Since in your case it is not healing and become very painful I would advise you to get yourself checked by a surgeon. He may prescribe you an antibiotic course and cream for local application. Meanwhile you should try to keep the area clean, avoid any friction and wear lose cotton under garments. I hope that answers your question.If you have any further questions please feel free to write. Thankyou for choosing healthcare magic.