A "flare" is a spreading area of Erythema or flush. It is the second reaction in the triple response to injury and is due to Vasodilation of the arteriole. When this flare occurs around the ankle, it is called an ankle flare. The condition is also known as a malleolar flare, in reference to the malleolus, the bone prominence on each side of the ankle.
Ankle flares are often caused by venous ulcer, due to deep vein thrombosis or . It is considered to be an early sign of advanced venous disease.John J. Bergan, Nisha Bunke-Paquette. The Vein Book. Oxford University Press, 2014. Treatment involves management of the underlying condition, along with supportive care.
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