KidsHealth: What’s a Birthmark?
Birthmarks get their name for one simple reason: They are marks that are present on the skin of a lot of newborn babies. A baby can develop birthmarks either before he or she is born or soon after birth.

Klippel-Trenaunay Syndrome Support Group
The K-T Support Group site was established to provide information about the group and about Klippel-Trenaunay Syndrome, and to provide families, adults with K-T, and professionals with links to the group.

KT Foundation
The KT Foundation is a group of volunteer advocates for those afflicted with Klippel-Trenaunay Syndrome (KTS.)

National Organization of Vascular Anomalies
The National Association of Vascular Anomalies (NOVA) is dedicated to aiding individuals in the management and care of vascular anomalies.

Vascular Birthmarks Foundation
The Vascular Birthmarks Foundation is an international charitable organization that networks families affected by a vascular birthmark, tumor, or syndrome to the appropriate medical professionals for evaluation and/or treatment.