Suggest Treatment For Grover's Disease

My husband has had Grovers disease for the past 8 months, using may salves, etc. prescribed by his dermatologist, to no avail. It still drives him crazy. Can you offer anything? Once I had a severe outbreak of psoriasis, all over my body, My doctor used diathermy (60 years ago) and it worked, never to return. Any connection? Thank you! sorry - I can't afford to pay for info on line. Thank you anyway. No pro-bono here? YYYY@YYYY