Yesterday I got a small itchy little red bump on my inner wrist, this morning I woke up with 12 of them that have spread up my arm, they are normal coloured until they get itchy, they look like tiny mosquito bites but I haven't been anywhere with mosquitos, my eczema hasn't affected me for a couple of years and I haven't spent too much time in the sun, any ideas what it is or how to treat it?