Ichthyosis vulgaris is a common genetic skin disorder characterized by dry, scaly skin. It occurs due to a mutation in the filaggrin gene, which is essential for maintaining skin barrier function. People with this condition often experience rough patches, particularly on the arms, legs, and torso. The severity of ichthyosis vulgaris can vary among individuals. While it is not contagious, it can be inherited from parents. Treatment typically involves regular moisturizing and the use of topical exfoliants to help manage the symptoms and improve skin appearance.