Vascular lesions include acquired lesions (eg, pyogenic granuloma Pyogenic Granulomas Pyogenic granulomas are fleshy, moist or crusty, usually scarlet vascular nodules composed of proliferating capillaries in an edematous stroma. The lesion, composed of vascular tissue, is neither... read more 
, nevus araneus Nevus Araneus Nevus araneus is a bright red, faintly pulsatile vascular lesion consisting of a central arteriole with slender projections resembling spider legs. Nevus araneus lesions are acquired. One lesion... read more 
) and those that are present at birth or arise shortly after birth (vascular birthmarks).
Vascular birthmarks include vascular tumors (eg, infantile hemangioma Infantile Hemangiomas Infantile hemangiomas are raised, red or purplish, hyperplastic vascular lesions appearing in the first year of life. Most spontaneously involute; those obstructing vision, the airway, or other... read more 
) and vascular malformations.
Vascular malformations are congenital, life-long, localized defects in vascular morphogenesis and include capillary (eg, nevus flammeus Capillary Malformations Capillary malformations are present at birth and appear as flat, pink, red, or purplish lesions. Port-wine stains are capillary vascular malformations that are present at birth and that manifest... read more 
), venous, arteriovenous (eg, cirsoid aneurysm), and lymphatic malformations Lymphatic Malformations Lymphatic vascular malformations are elevated lesions composed of dilated lymphatic vessels. This photo shows a cystic hygroma, or lymphatic malformation, on the neck of a 2-year-old girl. This... read more 
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