Update as of yesterday we took him to the vet as his mouth is STILL red, the vet took a picture of his mouth as best she could cos he was wriggling a lot. He bit me pretty hard but didn't drew blood, being at the vet makes him so very angry for some reason. She's going to pass the picture around, see if anyone else knows what might be causing it. I'll get a phone call in the next week if she has anything.
Thank you Dreamtree and Eros
*hugs*