For the past 4,5 days i have been getting really itchy, arms middle of tthighs, bum, behind knees pretty much whole body and as soon as i scratch white llumps appear, some as small as a mosqquito bite but some are a bit bigger and funny shaped and almost look like they could be popped (like a blister ) but then they go away if i stop itching for a while, red blotcches also appear near them but i think thats just from scratching . i dont have any pets and i dont think anything in my routine has changed, anny ideas on what it could be?