Dark circles under the eyes is the color of gray than normal number, giving a good rest or not, "the older" feeling, from a medical perspective, the dark circles of the following reasons:
1. lower eyelid skin pigmentation or stain. Because the skin around the eyes is very thin but regular contact with all kinds of cosmetics, so prone to inflammation, over time it will form a sink or stain color.
2. thickening of the subcutaneous veins or venous congestion. Fatigue can lead to poor blood supply, blood deposition in the deep dark of the orbicularis muscle, through the skin to form a black eye, and those fair-skinned people is even more meager prone to this phenomenon.
3. eye shadow. Especially those more serious bags under the eyes, in the light of the role in the formation of a shadow below it.
4. small wrinkles under the eyelids. Middle-aged women are often in the area there are many small wrinkles in the light, wrinkled than the smooth parts of the site to absorb more light, gives a gloomy feeling.