11-16-2009, 05:52 PM
Well, if its large, its possible its been there for a bit and was simply too small before for you to notice. I've had bumps form behind my ears that I didn't notice until they were unusually large and painful. Have you been dabbing the perfume there? Either way, it might be best to stop using it to see if the bump goes down and, if it seems to, later on switch to a perfume with natural ingredients. Its even possible that you increased the amount you are using, which is why the reaction got worse.
That's just my guess though. I'm no doctor and it could be many things, even simply a pimple on your neck(they sometimes don't hurt at first, but from your description it sounds a bit too large for that). If it doesn't go down, you should go to the doctor.