I'm not sure about how this would work on hairless skin, but it's probably worth a try. I use an old home remedy that is the only thing that works on my flaking, scaling scalp. (I've tried the shampoos you mention and Tegrin scalp de-itching lotion without nearly as much success.) I mix up a rinse of half cider vinegar and half water, put it in a plastic ketchup dispenser and leave it in the shower. After I've washed my hair, I put on this rinse LIBERALLY and DO NOT RINSE IT OFF. Then I blow dry and style my hair as usual. Believe it or not, my hair doesn't smell of vinegar once it is dry. I have used it on my skin at the temple are in front of the ears, which sometimes gets very red and scaly, scabby. It works. Good luck.