Written by Jennifer Robertson, MD, MSEd, NBHWC | Reviewed by Patricia Pinto-Garcia, MD, MPH Published on June 13, 2022 Key takeaways: Spider veins, also called telangiectasias, are swollen or damaged blood vessels. Spider veins aren’t usually dangerous, but they can have a cosmetic impact. Sclerotherapy and other treatments can lessen the appearance of spider veins. ...