Thomas Handasyd Perkins, American slaver and merchant with a prominent<unk>  on his cheek A healthcare provider can usually diagnose a<unk>  based entirely upon the history and appearance. In unusual cases, a skin biopsy may be needed to confirm the diagnosis. Depending on the location of the birthmark and other associated symptoms, a physician may choose to order a measurement of intraocular pressure or X-ray of the skull. An MRI of the brain may be performed (under anesthesia) on infants who have a<unk>  in the head area in order to check for signs of Sturge-Weber syndrome. If the<unk>  is inside the mouth, a provider may check the insides of a newborn baby's throat with a scope to see if there are any changes (growths) other than just the color. If the<unk>  is around the eye or on the eyelid, a referral may be made to an optometrist or ophthalmologist for a test of the ocular pressures in that eye. If swelling occurs in the<unk> , it may cause vision problems, glaucoma, or blindness.
Port-wine stain
Forchheimer spots
Bier spots
Elschnig spots
Riehl melanosis
Brushfield spots
Koebner phenomenon
Cameron lesions