I have had psoriasis for about 30 years. It started on my scalp, which over the years has been brought under control with a coal tar shampoo. I used to use Zetar, but as the cost went up, switched to a coal tar medicated dog shampoo, which works well as long as I shampoo daily. My question is about the other large areas I have on my back, buttocks, backs of legs, knees, elbows, and abdomen. I use a cortisone cream, but it's expensive, along with a moisturizing hand cream. I recently tried a creosote dip (also intended for animals) which is coal tar. I diluted a little in water and applied it to the patches. It helps a lot with the scaling, although still have the redness, but not as itchy. But then I read that creosote and coal tar are carcinogenic, so it may not be too good of an idea. Does anyone know of a coal tar cream intended for this use?