I get this red bump on my neck in the exact same spot about 2 times a year in the warmer months (Michigan). It always itches like crazy and is always the same size, and in the same spot. I'll notice a slight itch and start to scratch and with hours this bump pops up.
Last year it got pretty bad (I scratched a lot--couldn't help it) and I went to urgent care and they gave me a steroid and it pretty much cleared up within a few days--but they had no idea what it could be.
I'm using cortizone-10 plus currently, which seems to help with the itching.
What could this be?
I've posted a picture here: http://s278.photobucket.com/albums/kk90/brzycki1/?action=view¤t=100_0903.jpg