There are multiple reasons for dark circles to form under your eyes. The skin under your eyes is thin, making the underlying tissues more visible. Also, with less fatty tissue and the constant motion of facial skin and muscles in this region, wrinkles are more likely to form. Genetics play a role by affecting skin tone and texture. The contrast between skin tone and the darker coloured skin under the eyes will likely be more apparent in those with fair skin. Sun exposure can enhance the pigment under the eyes and darken the existing colour. Avoid rubbing your eyes, as this can cause dilation of blood vessels and bruising. Getting adequate sleep is essential to reducing puffiness and dark circles. If you are maintaining a healthy lifestyle and the dark circles are still a bother, use of concealers and foundations can even out your skin tone and provide a quick cosmetic solution. Just before bed, apply a moisturizer that is specifically formulated to sooth, protect and hydrate this especially delicate facial region. Use of an eye cream will provide a smoother texture to the area by filling in fine lines to improve the look of dark circles.