Need help with Grover's Disease and Itching

I’ve been diagnosed with “Grover’s Disease” I’ve had red bumps that have taken over my back and chest region of my body. My dermatologist did a biopsy on my chest and back and provided the diagnosis 2 weeks ago. I’ve been treated for lung cancer over the past 2 years. Every three weeks I receive chemo with an injection of (Kytruda). I’ve been off of my chemo for 3 months. My itch is beyond aggravation!! I apply various creams but haven’t found anything that has helped me control the itch nor the red bumps. Does anyone have any insight or a medical professional whom would have expertise in Grover’s Disease. We live in Daytona Beach Florida. Thanks in advance for your help. Regards