The MC1R (or melanocortin 1 receptor) gene helps decide your hair, skin ... near-black—but scientists believe that they’re all slightly different manifestations of blue eyes or brown eyes.

Dark circles under the eyes usually appear purple, blue, brown, or black ... Health conditions that can lead to dark under-eye circles include skin conditions, such as eczema and hyperpigmentation, ...

The study's scope was considerable, examining the DNA of more than 800 individuals, encompassing a varied range of skin tones from fair Scandinavians to dark-skinned, blue-eyed people in countries ...