Wash your ear thoroughly with soap & warm water. Watch it for the next few days for signs of infection: redness, swelling, drainage, pain. If you have any of these or a fever see a physician. If it's bleeding a lot, see a doctor now. If not, you might cover the wound with a band-aid. Keep the area clean!
Like dean said - you could also try calling the " stray cats" And ask them how to get your kitty To " strut " Maybe teach your kitty the stray cat strut - then it will not nip you. For it will be strutting .
The first thing to think about is if your cat has had his or her shots recently. If you didn't ever bother to get your cat its shots, it could have rabies or some sort of infection. However, this is unlikely. After you've determined that, you need to wash your cut with warm water and soap. Use a clean bandage to keep the wound from getting infected. I would suggest calling your pediatrician and telling them about the incident. Call your veterinarian and tell them about the incident as well. Get suggestions from both of them on how to further handle the situation.