keep it clean and drained. It needs to stay open to get all of the bacteria out and keep draining. He should also be on an antibiotic.
Clean and dry, and might try some peroxide and antibacterial ointment. Be really anal about cleaning it. Very important!
Please do not wait too long or your dog may develop a very unsightly ear. Your dog's condition needed immediate veterinarian attention.
The dog will feel much better after abcess has burst. Gently pull the hair around the area,,,if you see a place where it looks like something stuck in it..that's a good place to start. Hopefully this will help abcess open up. It will smell awful~!!! Let it drain. Do not let it seal back up. vaseline is very helpful in keeping it from closing back up. Use antibiotoic ointment and keep it very clean