why forehead vein moves
A bulging vein or ateriovenous fistula that develops on the forehead relates to blood flow between arteries and veins. Sometimes these veins arise as a result of exercise, injury, or underlying health complication such as kidney problems. Bulging veins on the forehead may be characterized by swelling, reddishness, or take on a purplish hue. Treatment options can involve surgery, according to the Merck Manuals Online Medical Library.