Want to find out about an illness or condition? Visit NHS Choices.

This site has detailed information on birthmarks, particularly on hemangiomas.

Support, resources, and information on medical treatment of birthmarks and hemangiomas.

This site offers information and helpful sites related to various port-wine stain and other birthmarks, including contact information for physicians in this field.

The official site of the International Society for the Study of Vascular Anomalies.

Read an article that describes spots on the skin that are sometimes mistaken for bruises.

Personal, yet informative site offering resources, feedback and support to others dealing with a similar situation.

An international charitable organization that provides support and informational resources for individuals affected by hemangiomas, port wine stains and other vascular birthmarks and tumors. Also sponsors relevant research.