Scoring high on the Dermatology Life Quality Index (DLQI)—typically a score over 10—can also trigger this classification. Review of Primary Treatment Options
Moderate to severe chronic plaque psoriasis is an immune-mediated condition characterized by raised, red, scaly plaques covering more than 3% to 10% of the body surface area. While there is no cure, recent medical advancements—particularly in biologic therapies—have made clear or near-complete skin clearance a realistic clinical goal.
Moderate is often defined as 3%–10% involvement, while severe is more than 10%. One percent is roughly the size of your palm.