Blood clots. From time to time, veins deep within the legs get larger. They may induce leg agony and swelling. Seek out clinical assist for ongoing leg soreness or swelling. This could indicate a blood clot. Occasionally varicose veins seem like cords within the skin. Any vein may become varicose. https://www.sgvascularctr.com/what-surgery-is-available-for-varicose-veins/