Dark circles are less about your bedtime than your blueprint. In many people, heredity sets the thickness of periorbital skin and the density of subcutaneous fat, creating a transparent window where micro‑vessels and pigment become visible even when sleep is adequate and lifestyle looks textbook healthy.
More responsible than any late‑night screen is anatomy. Under‑eye skin is among the thinnest on the body, with reduced collagen and elastin, so hemoglobin inside capillaries and deposits of deoxygenated blood scatter light through that tissue and cast a bluish or brownish hue that reads as permanent shadow on a rested face.
Equally underestimated is pigment biology. Genetic patterns of melanin distribution and post‑inflammatory hyperpigmentation around the orbit can deepen color regardless of how many hours you log in bed, meaning concealer and sleep hygiene alone rarely address the structural and vascular optics driving those stubborn circles.
