The evaluation of port wine stains begins with a history and physical examination.

Physical findings in someone with port wine stains include:

• Pink, red or purple patch of skin:
• Usually pink during infancy
• Becomes red during puberty
• Usually becomes purple during middle age
• May grow as child grows
• Usually located on the head or neck

The diagnosis of port wine stains is made during physical exam. Tests are not necessary to evaluate port wine stains.