I noticed what looks like varicose veins on either side of my tailbone. no injury, never been there before. i'm a 31 yr old female. cause for concern?

Veins: Varicose veins represent faulty valves and pooling of blood. If they are persisting I would recommend an exam by your physician to be certain that you are not a high risk for blood clots.

Not typical location: Although possible for veins to become dilated or prominent in that area however it is not a typical location for verifies veins , would advise to get it checked out by your doctor.

Veins on back: It would be very unusual to have varicose veins on your tail bone. See a vein specialist for an evaluation.