1. caused by strong exposure to ultraviolet radiation, some people do not pay attention to sunscreen, slowly ultraviolet radiation leads to uneven skin color on the face.

2. Clean skin is not clean, the use of a variety of make-up products, but did not thoroughly clean clean, and continue to accumulate, after the cause of uneven skin color.

3. Computer radiation, staying up late and resting insufficiently, resulting in skin pressure and cause uneven skin color.

4.