Talk to General Surgeon on Small Lump

I don't remember how long its been there but at least its been a few months since I've been feeling a small hard immovable lump on the floor of mouth against jaw bone. Its hardly visible but can be felt with tongue and by pressing against it. It wasn't painful until recently when I started touching it more often it feels like ulcerated and is slightly painful sometimes only. Reading articles on google and viewing images is nerve-shattering. Does this need x-ray or biopsy? Can anyone suggest something.