Erythromelalgia is a infrequent vascular illness characterized by periodic episodes of intense burning pain, discoloration, and heat in the limbs, particularly the feet and hands. The name “erythromelalgia” is taken from the Greek phrases “erythros” meaning crimson, “melos” meaning limb, and “algos” meaning pain. https://www.phlebotomytrainingtoday.com/what-is-erythromelalgia/