My 15 year old daughter just found a lump on her neck about 1/2 -1 behind her ear.  It is about the size of dime and protruding out quite a bit.  It hurts to turn her head and touch it.  It almost looks like a cyst or something but its not red or any sign of a bite or zit of sort.
Hi. Thanks for your query. Noted the history and understood your concerns. The commonest reason for such a swelling behind ear is an enlarged lymph node. The others ones are cyst. This can be confirmed by the following