Oral Cancer Pictures HELP...Is This Oral Cancer?

HELP...Is this oral cancer? - oral cancer pictures

Hello,
A lesion in the mouth / cyst appeared in my mouth and I'm going crazy!
) The size of a pea, of course (no blood and is a soft tissue injury. He grew up in the mouth behind the lower incisors on the bottom of my mouth.
It hurts, but I do not know what it is? "Can someone tell me what can that be? Do I have to show a dentist? Here are the pictures ...
http://new.photos.yahoo.com/sara_niyazi/album/1152921504632227704/photo/294928804345083680/0
http://new.photos.yahoo.com/sara_niyazi/album/1152921504632227704/photo/294928804345093076/1