1. Genetic predisposition and anatomical structure
When the skin around the eye socket is exceptionally thin with minimal subcutaneous tissue, blood flowing through the large veins beneath becomes highly visible near the skin's surface, creating a bluish-black halo known as dark circles.
2. Insufficient Sleep and Excessive Fatigue
When eyelids lack rest and remain in a tense, contracted state, blood flow to this area increases for prolonged periods. This causes the blood vessels in the subcutaneous tissue around the eyes to become engorged, leading to stasis and the accumulation of dark shadows.
3. Kidney Qi Deficiency
Leads to insufficient nourishment of the eyes by vital essence
4. Individuals with chronic illness, weakened constitution, or recovering from major illness
Darkness accumulates superficially, causing dark circles under the eyes.
Due to the thinness of the subcutaneous tissue around the eyes, the skin is prone to pigmentation, which readily manifests as dark circles on the upper and lower eyelids.