Very visible enlarged blue veins on top of hands, base of thumb, and wrist. Alway enlarged, and drain immediately when hands are raised. Veins can be seen on forearms as well. I am in good health, 28 male, can run a few miles with minimal effort. I smoke occasionally. Many of my occupations have involved sitting or standing for long periods of time. I have all used a keyboard extensively, could I have caused this from years of resting hands and wrists on desk? Skin seems to be thinning in these areas any help in understanding what needs to be done to correct would be great.