Noticed the other day on the right  side of neck one maybe 1-1.5 cm, hard, movable, painless lump. Feels like a BB. Directly above it is now another one except it is smaller. I had mononucleosis as a teenager and it feels nothing like this. I am not, nor have I been sick. I am in my mid thirties.
HiS welling in the neck along the sides, is most often related to infection in the ear or, throat. Since the lump is painless and quite small, don't bother much. However, if it increases in size, or becomes painful, then do consult your doctor for further treatment. Regards