Xerosis: Abnormal dryness of the skin, mucous membranes, or conjunctiva (xerophthalmia). There are many causes of xerosis, and treatment depends on the particular cause. From Skin Problems and Treatments Resources How IL Inhibitors Work to Treat PsoriasisHome Remedies for Hidradenitis SuppurativaHow Your Skin Ages Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew