RIGHT
so last night I was lounging in the living room with my housemates, and went to scratch my neck and noticed that instead of my usual nice smooth skin (or something close to that), it felt weird and bumpy on one side. This morning I looked in the mirror and now not only are there patches of little red bumps on my neck, but it's on my collarbone area now too.
What the shit?
I can't think of anything I'm allergic to. The only thing I could think of at the time was that yesterday I was wearing a wool sweater - but in that case why aren't my arms also bumpy?

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It's possibly a heat rash.

Don't worry too much. Get some antihistamine if you think its an allergy X

Maybe you were sitting on one of those toxic sofas? There was this big thing with sofas treated with something in China that caused massive skin irritation.
BBC NEWS | UK | Pay-out due in 'toxic sofa' claim

Or it could be your woolly jumper and the skin around your neck is just more sensitive.

I don't understand, though, cause I've worn the jumper and the scarf I wore the other night before with no problem.
Anyway. I have Piriton now. It was freaking me out with its list of side effects but I took it anyway. The drowsy will help me sleep

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Maybe your can of mace is leaking and you got some on your neck.