Overactive thyroid/Bumps on neck/jawline

Recently I have had a breakout of small bumps on my neck. I have had Acne since I was a teenager (I'm 25 now), but these bumps are not pimples. Someone has suggested that I may have an overactive thyroid. I am 5'5 110lbs and eat A LOT, never feeling satisfied. Today I noticed some swelling, kind of a knot that is not painful, where my chin and neck meet. I have eat very healthy and exercise regularly and feel great other than these painful, ugly bumps on my jawline. Do you have any suggestions?

Thank you!