What Are Dark Circles Under The Eyes?   Dark circles under eyes refer to discoloration of the skin. The color of the dark patches may be brown, blue, purple, or gray based on skin color and the reason behind dark circles. However, under-eye dark circles are not considered a medical issue. However, if there is pigmentation or any change around the eye area, then it indicates some sort of allergy, irritation, or even dehydration. It is necessary to know the root cause of the dark circles to determine the dark circle treatment.    Dark circles are also due to:   …