Small, nearly invisible bump near sublingual gland below tongue, half inch to the right of center for a couple of weeks. it is not growing. was painful at first but now it is not. ?

Blockage: Most likely, what you describe sounds like a blockage of one of the submandibular glands that produce saliva and bring it to below the tongue. You should seek an evaluation from an oral and maxillofacial surgeon. In the interim, start warm salt water with a little lemon in it rinses for 5-10 minutes 3 times a day. If the pain increase, stop and see the doctor.