Ninety percent are visible within two years after birth. Venular malformations occur on the head and neck as the most common sites. Lips, tongue,buccal mucosa, buccal fat space and from upper lip to nasal vestibule are common. Venous malformations commonly occur on the head or extremities. Lymphatic malformations commonly occur in the head and neck area.
Mixed malformations can occur anywhere on the body.