I wrote:I have a 5 and a half year old piggie. This morning I noticed a lump under his chin. I don't know if it was there before, but it definitely grew a lot over night. I read about other pigs with the same problem in this thread. Being Saturday I can't even get a normal vet, and there is no exotic vet around here. Should I give him antibiotics? And in what dose?
We can't provide advice that should come from a veterinarian who can examine your guinea pig. Provide supportive care and see a vet asap.