vascular malformations

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Vascular malformations – These are caused by abnormal development of blood vessels and are almost always present from birth. Port-wine stains, a very common birthmark, are a type of vascular malformation and can be found anywhere on the body. These can be identified as flat birthmarks that are pink-red at birth and darken to a red-purple color after several years. Port-wine stains do not fade or go away. These birthmarks may be a concern if located on the face above or around the eye because they may be associated with eye and/or brain problems.

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Are these vascular malformations the same as hemangiomas or similar? Both are red. How do you differentiate between them?