The evaluation of birthmarks involves a history and physical examination.
Physical findings in those with birthmarks include:
- Skin lesions:
Testing is not necessary to make the diagnosis of birthmarks. However, tests may be needed to identify the type of birthmark, or to investigate additional abnormalities that accompany birthmarks.
Tests that may be used to evaluate birthmarks include:
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- Geronemus RG, Ashinoff R: The medical necessity of evaluation and treatment of port-wine stains. J Dermatol Surg Oncol 1991 Jan; 17(1): 76-9. 
- Goldman MP, Fitzpatrick RE, Ruiz-Esparza J: Treatment of port-wine stains (capillary malformation) with the flashlamp-pumped pulsed dye laser. J Pediatr 1993 Jan; 122(1): 71-7.