Dark Circles Under Eyes: What's Actually Going On and How to Fix Them Okay so dark circles — honestly one of the most annoying things because no matter how much sleep you got, you still look like you haven't slept in three days. They show up as those bluish-purple shadows, brownish patches, or just that hollow, sunken look under your eyes. And the frustrating part? They can happen for like a dozen different reasons, so there's no one-size-fits-all fix. What Are Dark Circles? The skin under your eyes is really thin — about 0.5mm. So thin that you can literally see the blood vessels and structures underneath. That's why that area darkens so easily. Depending on your skin tone, they look different: Lighter skin: More of a blue or purple tint Medium skin: Brownish or reddish shadows Darker skin: Deep brown or grayish — and honestly harder to treat There are also different types — some are pure pigmentation, some are from visible blood vessels, and some are ju...