What Causes Lump Under Chin After Having Tongue Piercing?

Hi, i got my tongue pierced on Wednesday and i have been cleaning it with the salt water solution as directed, using bendryl or ibuprofen for the swelling. But yesterday i had a coca-cola and i noticed after that a a hard lump has developed on the outside under my chin. You cant really notice it but you can feel it when moving your hand over it. Im kinda scared hoping its not infected. Im hoping its just part of swelling or if maybe the ball from the piercing is laying on the bottom of my mouth at night. Not sure! But my mom gave me bendryl just to see if its the swelling and were hoping its going to kick in and bring it down a bit. If not, then im going to the hospital to check it out. Any suggestions on what it might be , pleeeeaaasssee!