Does anybody know about a superficial thrombophlebitis and is it fatal?

Surface vein clot. Superficial thrombophlebitis is a blood clot in a superficial vein, just below the surface of the skin. It is most common in the leg in a preexisting varicose vein. While it can be quite painful, the chance of fatality is very small. This would oily happen if the clot extends into a deeper vein and breaks off, traveling to the lung. While theoretically possible, this would be very rare.
Svt. This is a blood clot in a superficial vein It usually only requires local care,warm or cold compresses aspirin The risk is if the clot is close to the communication with the deep system then it needs to be treated with blood thinners.