Oral infections?

I have a sore in my mouth that runs down the inside of my cheek. It starts a little below were my gums and cheek come together, and down to meet the bottom of my top side teeth. The sore itself looks like a while like, and as if I were to break some thin skin I would get some puss out. The skin around it is irritated, but not much reader than the rest of my cheek. I had a period of time were I didn't brush my teeth for about a month maximum. When I started again I started having what I thought were tooth aches, but after two days I noticed the white line. Does anyone have any idea what it might be and if I should be worried about it? For the time being I'm trying to clean it the best I can, but not too much as to give it time to heal if it is even doing that. The pain was on both sides of my mouth, but one side seems to be getting better.. as it wasn't as bad as far as the pain went, or how it looks.

[turkee23]

could be thrush.... u should go see a dentist and make sure you brush your teeth atleast 2 times a day

[Karikun]

I looked up thrush, and it looks nothing like what I have. The sore is still there, but it seems to be improving slowly since I started brushing my whole mouth after breakfast, and before bed. I'm just hoping that it's just something simple like somehow I cut my mouth or something.