I'm a 30 yr old female with anxiety disorder and constantly under stress. Recently, I noticed a small lump on my right side, towards the bottom of my neck (between the base and shoulder). It is painless, moveable, and changes in size throughout the day, but it is never bigger than approximately 1 cm. It feels spongy at times, but then it gets firmer. I've also been experiencing sinus/allergy/rhinitis issues due to the season. Other than that, I have no other symptoms. Any idea of what this might be? Any opinions are greatly appreciated.