I have this bump or knot in the back of my head on my left side at the bottom. It has been 3 days now and it hurts, even to touch it. It causes the left side of my neck to hurt and uncomfortable to sleep on that side. At times it can feel like a have a small headache at the back of my neck. I went to a Physician, but she really couldn't tell me anything, because I guess she was a nurse practitioner. She prescribed me some antibiotics and told me to come back in about 2 weeks. I'm just curious and scared. I just want to know what it is? Help me please?