Thanks for this answer, I have the same thing going on with one of my roosters.Never cut into flesh that is only swollen. Unless this is actually a case of bumblefoot, which it sounds like it is not, do not cut into this. Sounds like some sort of internal infection to me. Cutting is only going to open up a risk of more infection entering the body.
If this were my bird, I would get him on PenG or Amoxicillin. I would keep the foot wrapped at all times, possibly use Preparation H to help with swelling, maybe even 1 baby aspirin (or a 1/4 of an adult aspirin) once a day to help with inflammation and pain.
If you have an avian vet that can look at this, I would definitely take him in.
Keep us posted!
