Kako, i can't help with Darier at all. @gardeningjunkie seems to know a lot about different sorts of skin issues so hopefully she can weigh in. As it relates to Grover's disease, i shared in a prior message what my whole crazy regimen is. Combination of OTC products as well as prescription. While i have the rash, it's not that bad - but i do have itchiness all over my torso and neck - which my approach seems to help with (at least between applications of all the creams and lotions). The only "cure" i have read here is what was posted last week about taking cilantro. Only time i have read that people have seen something that looks like remission. Of course Grover's tends to go away and come back, but the cilantro story was appealing to me that i started taking cilantro extract two days ago. It's not the most pleasant taking stuff but i am going to stick with it as my travel schedule is not going to support me carrying around bunches of the real stuff to eat everyday. Oh, related to sun - my dermatologist told me that sun was great for it - when i went away to the Caribbean i did notice a lot less itching (of course, i wasn't wearing much clothing most of the time so there is that). But i bet your normal disposition to the sun as well as whether sweating bothers your particular situation is going to be more relevant. I have to stay away from accutane - sensitive liver and frankly i guess i would rather be itchy than dealing with a problem liver. But that's me - see what others say about it - i have read it does work to reduce the rash as does light treatments (see point about the SUN above) but each has its own challenges.

Good luck.