Hi! I just found a pea sized lump behind my ear, about where the skull meets the ear. My allergies have been acting up and I hope IRS just a swollen lymph node. Can anyone help me? I have ulcerative colitis and my mom freaks when something is wrong with me so I don't want to worry her... Help!

Yes it is a swollen lymph node which is the body's frontline warning system for any kind of infection going on in your body. Which in your case is your allergies, a very low grade infection that would not necessarily need antibiotics to cure.