Things I learned from studying dark circles.
A higher percentage than expected is due to pigmentation from rubbing the eyes / rhinitis.
If you do not really want under-eye fat repositioning, Ultracol 200 seems the safest.
(Fillers, boosters, threads) I am not really planning to do surgery.
For blood vessels, it seems they can be removed one or two at a time with something called vascular sclerotherapy injections.
They say habits are important too, but it does not seem easy.