I have had Grovers disease for over four years, diagnosed for 1 1/2. None of the patent medicine was effective enough. Then I learned that the rash is triggered by eating foods containing SULFITES. They are naturally occurring in several commonly eaten foods ie. grapes (vinegar, wine etc,), peppers, onions, garlic, soy, peanuts, cabbage, brussel sprouts, molasses, mushrooms. Sulfites are added to many packaged foods and sprayed on much American produce for preserving a fresh look. SOLUTION: Buy organic produce and meats, grow your own, use rice vinegar. Knowing this has GREATLY REDUCED my occurances of the Grover's rash. Also a very effective topical cream is available on Amazon called "Eczur Cream" by Elimia. It costs $23 +/- for a very small plastic jar. But you don't need much and it works, especially after showering with a low chemical soap.Now I go weeks at a time with no itchy bumps!