I'm a 29 years old healthy male, I exercise daily and have never had any serious condition. Around 10 days ago, I noticed a small lump in the right side of the my neck, on the underside of my jaw above my adam's apple. I believe it's actually a lymph node, but I can't tell for sure. A few days ago, it was noticeably larger than it is now. Right now, I'd say its size is 3 or 4 mm, while a couple of days ago was 6 or 7 mm. It is painful and firm, but it does sort of move around if I grab it.
I don't want to wait for another week until my doctor can see me, so I decided to ask a question here. The main thing that helps me stay calm is that it shrinked over the last few days. Can I stay calm or should I still worry about it?
Thank you very much in advance.