My advice is also to go see a doctor or a dentist who can look at your oral lesion. But since you just want "possibilities", here is a link to almost all of them with pictures
A Guide to Common Oral Lesions
Or a nice powerpoint in Pdf
Lumps & Bumps 101
I'm sympathetic here but really you need to see a doctor or dentist or you will drive yourself crazy

Charm

65 yr Old Frack
Stage IV BOT T3N2M0 HPV 16+
2007:72GY IMRT(40) 8 ERBITUX No PEG
2008:CANCER BACK Salvage Surgery
25GY-CyberKnife(5) 3 Carboplatin
Apaghia /G button
2012: CANCER BACK -left tonsilar fossa
40GY-CyberKnife(5) 3 Carboplatin
Passed away 4-29-13