Well what will happen is you will mess up your nipple, you will not have pierced it correctly, and you will possibly end up with a secondary infection. WikiAnswers is not a venue to provide how to information that can lead to personal injury. See a professional body piercer, be smart.
Chat with our AI personalities
If your nipple has a cut, you may get some relief from putting a small amount of triple antibiotic ointment on it to help it heal. If it doesn't get a little better each day, see your health care provider.
as long as its not a deep cut your body will just heal the same as a cut on your finger would.
A surgeon could try to re-attach it. But because of dense sensory nerves, the likelihood of success would be very dire. You would end up with chroni24-hour a day nerve pain.