[Pictures] Fleshy flap under tongue

Greetings. I'm a 22yo male with no previous dental history apart from a few cavities. I smoke very irregularly (haven't in months, at max 1-2 times/wk). I recently noticed a flap of skin under my tongue. It's loose and fleshy, and it sticks out where the bottom of my mouth meets my tongue to the right of my frenulum.

There's an album of pictures here: http://imgur.com/a/hw8zM . I'm talking about the (fairly obvious) crescent-shaped lump on the left side of my mouth in the pictures. It's actually on my right.

Is it a Fimbriated fold or something else? Should I be worried that it's only on one side of my mouth? Thanks a ton!
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