Why don't mosquitoes target the visible blood vessels under the skin?

Question

We can see numerous veins under our skin. Why don't mosquitoes suck blood from those vessels? Why don't they use better option?

Answer 1

They don't detect you by vision. Your skin is uniformly attractive by "odor" (water vapor emission). Vampires, now, vampires do detect the big veins. So there's a correlation of size of the hemaphagious predator to the feeding cues it utilizes.

--Cheers, -- Mr. d.