I get inverse psoriasis under my breasts and the ONLY thing that will get rid of it/stop the burning is a mixture of extra virgin coconut oil and turmeric. I just make a paste and apply topically. IT IS MESSY! Be sure to cover exposed areas. This topical ointment will usually get rid of the raw areas within a few days...every time.
Oh, and for itching, if you have the plant called autumn joy (sedum) in your yard--go out and break a couple of leaves off and rub them into the lesions. This works for mosquito bites too.