Hi Thanks for your query. Psoriasis causes your skin to dry and can therefore lead to scratching, itching, and burning which can make the skin condition worse. To prevent these skin-aggravating symptoms, it is important to always keep your skin moist by applying a moisturizer all over your body. Moisturizing the body will prevent dry plaques from making it difficult for you to move and help you maintain your flexibility, Petroleum jelly is a simple moisturizing option.