What can cause anterior accessory saphenous vein pain across the front of the knee. i also have a lot of varicose and spider veins. ?

Thrombophlebitis: Superficial thrombophlebitis often occurs in varicose veins. It may extend up & down the saphenous vein or may stay confined to a cluster of tributary varicosities away from the main saphenous vein. While it can follow trauma to a varix, it frequently occurs in varicose veins without a precursor. Thrombophlebitis in a varicose vein develops as a tender, hard knot & is often surrounded by redness.

Accessory vein.: The anterior accessory vein is a major branch of the saphenous vein and usually originates in the upper groin. This vein can become abnormal if the valves in this vein reflux (malfunction) and this can lead to varicose veins, pain and many other symptoms related to the abnormal vein. This vein can be treated by a closure procedure and , usually, microphlebectomies. See a vein specialist.