Erythromelalgia is a uncommon vascular condition characterized by periodic episodes of intense painful burning, discoloration, and warmth in the extremities, particularly hands and feet. The name “erythromelalgia” is taken from the Greek words “erythros” meaning red, “melos” meaning appendage, and “algos” meaning pain. https://www.phlebotomytrainingtoday.com/what-is-erythromelalgia/