my little girl Miley has had this swollen lip for a couple days. This has happened before when she was around 6 months old and we deduced it was because she has some allergy to the cheap plastic bowl we were feeding her in. After changing this to a new stainless steel bowl it went away after a few days. Now, suddenly it has come back. She still is using the stainless steel bowl and the only thing I can think of that changed was her food type over a month ago. She is still on friskies just a different flavor. She eats dry food. Any ideas on what else this could be? Open to all suggestions!