Vascular Birthmarks Foundation 
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.
http://www.birthmark.org/Birthmarks and Hemangiomas InterNETwork Support 
Support, resources, and information on medical treatment of birthmarks and hemangiomas.
http://members.tripod.com/~Michelle_G/indexH.html
Shine On 
Personal, yet informative site offering resources, feedback and support to others dealing with a similar situation.
http://www.angelfire.com/ab2/birthmarks/
Mongolian Spots - DrGreene.com 
Read an article that describes spots on the skin that are sometimes mistaken for bruises.
http://www.drgreene.com/21_1143.html
AR Children's Hospital Birthmarks Homepage 
This site has detailed information on birthmarks, particularly on hemangiomas.
http://www.birthmarks.org
Birthmarks.com 
This site offers information and helpful sites related to various port-wine stain and other birthmarks, including contact information for physicians in this field.
http://www.birthmarks.com
International Society For The Vascular Anomalies 
The official site of the International Society for the Study of Vascular Anomalies.
http://www.issva.org
The Hemangioma International Treatment Center 
Provides comprehensive treatment options to patients affected by hemangiomas and vascular malformations. Find details about vascular birthmarks, treatment options, news and testimonials. Located in Charleston, South Carolina.
http://www.hemangiomatreatment.com
Sarah's Progress in her Battle with Hemangiomas 
Blog is dedicated to couples searching for help for their child diagnosed as having a port wine stain on her face.
http://www.porkchopsarah.blogspot.com/