They’re easy to see because they’re superficial
veins close to the surface
of your skin and typically occur
on show up in your legs, feet, ankles and hands. While bulging veins are usually harmless, they can be a sign of a more serious problem like a blood clot." https://my.clevelandclinic.org/health/diseases/22877-bulging-veins
It may actually still be varicose veins which is common in 1 in 3 adults. For most people, a bulging vein is truly harmless. Unsightly, perhaps.