What does it mean if I see a little red vein in my wrist?

The body uses vitamin B2 (riboflavin) to carry oxygen to the surface of the skin and the pupils of the eyes. B2 is a water soluble dye that makes your urine bright yellow, so long as there is any in your body. When the color fades, then it is time to get some more vitamin. When the body is deficient for a while, arteries grow into the tissues to carry blood there. Once that happens it is quite difficult to get them to go away.

B2 is destroyed by alcohol, so that is why people get bloodshot eyes when they are drunk. Some people need more B2 than others due to hereditary conditions. For example, Irish people are famous for their red noses and ruddy complexions.

Taking B2 pills sometimes does not correct the symptoms. That is because you have to take a low dose every hour to get results. I don't know why. I once carried a bottle of pills to work intending to take one every hour. I could not remember to do it, and I finally gave up. My eyes have always been bloodshot.