Betsy:
The other "official" name of Grover's Disease is, "Transient acantholytic dermatosis." As you can tell by the first word, the condition reputedly comes and then goes, though it can last a few months. It's possible that not every spot you get is part of the same condition, though. Many patients get what amount to blocked pores, and these may look like the bumps of Grover's and they may itch. I'd work with your skin doctor on evaluating and treating these.
Best.
Dr. Rockoff