Sounds like Keratosis Pilaris, also known as "chicken-skin" because the bumps look like "goosebumps". The keratin that is normally shed and sloughed off your skin is being backed up in your hair...
It may be that you have an infected hair follicle, oe a swollen lymph node. Other possibilities exist, as well. The best course of action would be to have it checked out by a doctor.
i am 11 years old and two days ago i found a small bump on the left side of the back of my neck. it kinda hurts and i am very concerned. i asked my parents and they don't know( they are both great...