I have an ulcer in my mouth, at least that's what I think it is... The weird thing is that it is like a slit in my gum. Kind of like a cut. It hurts really bad, it's sore and anything that touches it makes it hurt. All my ulcers I've ever had have bubble-looking though, not like this cut-looking one. It's pretty wide too. If anyone knows what this is, please help? it's been in my mouth for this will be the third day.