The FDA does not name merchandise but do give some very good advice, in which read the label.
These are gritty sludge like creams which contain abrasive ingredients and a cleanser. Neem oil is likely the appropiate product available for the treatment of psoriasis. https://medium.com/@cbdskincare1_66997/top-5-benefits-of-plant-based-skincare-for-asian-women-2a4273eb95df