There are more reasons for yellowish face with chloasma, which may be related to heredity, endocrine hormone disorders, sunlight exposure and so on. 1. Heredity: chloasma has family hereditary tendency, genetic susceptibility is one of the main causes of chloasma. 2. Endocrine hormone disorder: if women often stay up late at night or take contraceptive pills regularly, their bodies will have different degrees of hormone disorder, which will lead to yellowish color and chloasma. 3. Sunlight Exposure: If you are often exposed to sunlight for a long time, or work under the light source with strong radiation, these situations will cause melanin synthesis to accelerate. These situations will cause melanin synthesis to accelerate, which will lead to pigmentation and chloasma. If you have chloasma with yellowish color, you need to find out the cause of the problem as soon as possible and take appropriate preventive treatment in time.