What Could A Painless Neck Lump That Has Decreased In Size Over Months Be?

I have an odd lump on the left side of my neck. It blend in with my skin, so it s not a different color or anything, but I can squeeze it and it s seem to have gone down in size after a few months. It doesn t hurt. When I squeeze it, these odd little white flecks come out, they remind me shavings from a stick of solid deodorant. Was is it?