I do not know of specialists in Nevada; the closest vascular birthmark specialist would likely be Dr. Frieden:
Dr. Ilona Frieden
University of California at San Francisco
San Francisco, CA 94115
Nurse: Louise Crotwell 415-353-7823
A pediatric dermatologist who treats all birthmarks with a special interest in vascular anomalies. Office includes a multidisciplinary vascular anomalies team: dermatology, plastics, interventional radiology, and ENT.
Please do take advantage of the 'ask the expert' section on this website to get opinions on your case.
I would suspect that you do not have a true hemangioma if this was diagnosed at age 17. True hemangiomas are present at birth or shortly after, grow and then involute. It isn't uncommon for the term "hemangioma" to be used incorrectly to describe vascular lesions. A proper diagnosis will allow you to research the proper treatment options.
Please feel free to email me if you have any questions