I would argue in favor of at least a moderate use of moisturizers if you have psoriasis because moist skin heals faster and then stays healthier / stronger.   During the winter months in Phoenix, when a chilly, desert wind blows over the valley, my knuckles dry out so much that they crack and bleed.  They also itch, which is not so much from psoriasis as it is irritation from being damaged and possibly from being infected.

Some of the areas that are prone to psoriasis such as the elbows, legs and torso are prone to dryness, which can result from seasonal climate changes.  Excessively dry skin is a mild sore of skin trauma, which can lead to minor infections.  This is a bad thing because both skin trauma and infections are common causes of psoriasis outbreaks.

So at least some amount of moisture is good… but the kind of lotion or moisturizer you apply should also be chosen with care.

I personally prefer moisturizers that “feel clean” on my skin, or any kind of lotion or oil that won’t clog my pores.

Common ingredients found in moisturizers that can react negatively with psoriasis include: Aloe vera, lanolin, vitamin E and alpha-hydroxy acids. Depending on your body, you may have negative reactions to any, all or none of these ingredients.

Moisturizing alternatives that you might consider include olive oil, petroleum jelly and anything containing lactic acid.  Oils and/or ointments can be more effective than creams at preserving a consistent layer of skin moisture.  On the other hands, oils might not be such a good choice for people who already have oily skin.