cold sores, you get them when you drink from someone who is sick.
go see your doctor i could be infected and if you leave it too long you could have tongue problems :/
SMARTIES!!
Stop being nasry and stupid and put stand cream on it
Mouth ulcers wich should clear with bonjela, a cream for the mouth. An abcess which is like a tooth infection but can spread. Do you smoke? This could be some form of cancer. You should see your...
usually herpes simplex virus type 1 (cold sores) for more info go to:http://kidshealth.org/teen/your_body/skin_stuff/cold_sores.html#