VERY happy to have discovered this site. I'm in the same situation as all of you. Forearms and back of neck sting and itch like crazy--not constantly, but often. I do not know what causes it. Have been to a dermatologist who diagnosed BRP. Also went to an allergists who preformed all sorts of tests. I have tried desperately to try to link the onset of the stinging to some action on my part and can't really come up with much-----wool clothing may affect it, sun exposure, stress, elevated skin temp, all seem to play a part. I've tried all the topical lotions--no help. Have tried B12 and "think" it helps. Next is an MRI to determine if there is any cervical nerve damage.
It is an awful thing to have. I really think that if it was unrelenting that I'd go insane----yes, that bad.
Keep postin --- really good to hear from others.