i have never used this but use of it for lesions on the skin go back to the mayans. i would have to do more reseach. it doesn't say it is a cure for psoriasis. it justs says it helps open wounds from bleeding and it has tannin in it to prevent the lesions from getting infected. i haven't had infected psoriac lesions i just have it on all my extremeties and back and front. legs and back are the worse. i use soothing creams.