Severe itching can also be related to kidney disease, my mom would itch terribly from it. I have Grover’s Disease, it was confirmed with a biopsy. I use Calcipotriene which is a prescription and I use CVS Itch Relief and Calmoseptine which someone recommended on the Grover’s Disease Support Group on Facebook. I buy it at Costco but you can also get it on Amazon, it’s cheap. I also find using ice packs help me a lot. With the 3 different things I mentioned, I put each thing on about 15 minutes apart. There is also one other thing I use, Sarna Calm & Cool and I keep it in the refrigerator, which is what my dermatologist recommended, it makes it more soothing. I find anything with zinc or menthol helps.