After I exercise and my veins are protruding I can see on my left bicep two or three tiny little bumps that seem like they are on my vein, they aren t raised or anything but are wider than the width of the vein itself there s nothing hard or resistant that I can feel maybe it s a little bit hyperbolic to be concerned but I figured out of curiosity I would ask
don't worry due to exercise blood circulation increase in muscle like biceps and similarly increase venous return from them. It results in increase in diameter of veins and these bumps are valves into veins. These are normal and work out harder.