I have been bitten by a tick recently, in the lower neck region, and I have since been doing a lot of reading about this. Apparently tick bites can be very dangerous indeed! And sure enough, I now have a lump on my lower neck. Does this mean have Lyme Disease?
When were you bitten by the tick and when did the lump appear? They might not necessarily have anything to do with each other. Just a possibility you need to explore! And I think there are tests around for Lyme Disease, so if you are really worried you can request one of those. Good luck and I hope everything turns out OK in the end.