Background and Aim: Hobnail hemangioma ( targetoid hemosiderotic hemangioma( is a benign vascular tumor that is usually characterized as a papule with an ecchymotic halo on the periphery. It is usually seen in young adults and most commonly affects limbs. The lesion is seen equally in both sexes. https://hrzckxekqnni5o.theisblog.com/35125349/a-dynamic-and-adaptive-selection-radar-tracking-method-based-on-information-entropy