What is the lump on my jawline and how could I treat it?

The past year I’ve noticed a lump on my jawline. I saw my Dr about 6 months ago, she said it’s likely uneven fat distribution. I’m 28, 5ft 7 and 120lbs and haven’t gained any weight. It feels like a squishy sack underneath, not large or hard etc. It’s really knocking my confidence, it’s not like it on the other side, the other side it just straight when I put my head to the side. Thanks in advance.