Here are some of the most common causes of true under-eye circles. Allergies Atopic dermatitis (eczema) Contact dermatitis Fatigue Heredity — dark under-eye circles can run in families Pigmentation irregularities — these are a particular concern for people of color, especially blacks and Asians Rubbing or scratching your eyes Sun exposure, which prompts your body to produce more melanin, the pigment that gives skin its color Thinning skin and loss of fat and collagen — common as you age — can make the reddish-blue blood vessels under your eyes more obvious...consult dermatologist