What could be causing visible and green/blue veins on my face?

I always knew that I had a faint green baby vein under one of eyes, but never thought anything of it; however, I recently looked into an extremely well-lit makeup mirror today only to see that little vain... and the other veins that it connected to. The upper left corner of my face showed a very clear, partial image of the vascular system in my face, which was pretty freaky and kind of made me self-conscious. In normal lighting/everyday life, they aren't visible, at least I never noticed them until I was in front of that brightly lit mirror.

I instantly thought "varicose veins" until I looked it up; these veins don't bulge at all; my entire face is smooth. I also read somewhere that this can come with having very clear/blemish free skin (which I have), but I've never really heard of that. Have you know that I'm a 20 year old woman with medium to dark brown skin.

My face didn't look too different from this, only my veins looked a lot thinner/cleaner, and were green:

What could be causing visible and green/blue veins on my face?


What could this be? Is it bad?
What could be causing visible and green/blue veins on my face?
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