I was diagnosed with GD about 9 months ago, starting on my inner thighs, and now has spread from head to feet. The symptoms started with my wife itching, and 2 weeks later I had the same itching, and continued to track her itching to chest, back, and arms. Although the dermatologists are certain GD is not contagious, they cannot explain how we both have it (also eliminated scabbies). We of course thought it must be contact dermatitis, we changed bed, clothes, furniture, detergents, soap, food, etc., and had no effects. The itchy areas mostly do not have bumps or a rash associated, just terrible itching. TAC .1%, Eczema lotions with oatmeal provide only temporary relief, as do hot showers. Our next step is to try UV light treatments, as a close MD friend found this to be very effective.
jameswb- go to the New Zealand Dermatology site and study Grover's, they also have photos. I have never heard of Grover's without a rash or bumps. I have 3 forms of eczema, Grover's is one and I am a classic case. New Zealand site list 5 criteria, and I have 4 of the 5 with the fifth being that most are male. It also list triggers. There are at least a dozen forms of eczema, even the NEA doesn't list Grover's as it is less common. I would search this site for other forms that may be more similar to your symptoms. Guessing what allergens you have won't work. Study the 5 Day Extended Patch Test for Allergic Contact Dermatitis. I guessed wrong for 10 years, after this test I learned what to avoid for this form and now am ACD symptom free. One of my various ACD symptoms was internal itching and stinging with no rash.