On May 17, 2015 I noticed a lager lump (swollen gland) on my neck just below my jaw line. I didn't think anything of It because I felt fine and had no other symptoms, but I went to the Dr anyways. After after 10 days of antibiotics it continues to get bigger. It's not painful, or moveable, feels rubbery. My cbc and thyroid test came back normal. What could it be?