Hello Dexter454
I too had never heard of Grover's Disease but I do see there is quite a lot of info on it - even though it is considered a "rare" skin ailment.

Here are 2 links:
Basic Info: Grover’s Disease: Symptoms, Causes, and Treatment

Mayo Clinic Info: Treatment for Grover's Disease Geared Toward Relieving Itching and Rash - Mayo Clinic News Network