Wednesday evening, I unintentionally fell asleep propping my chin/jaw with my fist. Thursday morning, I noticed a pea sized, moveable lump located on the right side of my neck/jaw. Could I have caused a bad bruise that is swollen? I just had blood work (ordered for new pregnancy)done a few weeks ago that came back normal. Should I be concerned? No other symptoms. Lump is not painful, I'm just aware of it.