[thirteen] In a very tumor for instance infantile hemangioma the mass is tender, and simply compressed, as well as their coloring is due to dilated anomalous included veins.[14] They're most commonly located in the head and neck. Venous malformations are the type of vascular malformation that will involve the veins. https://www.sgvascularctr.com/all-things-vascular-singapore-guide/