There is a small piece of chest yellowing may be due to sebaceous gland pigment metabolism abnormalities, can be treated by diet or laser. 1. Diet: If there are no obvious symptoms, there is no need for special intervention, you can reduce high cholesterol, high saturated fatty acid, high calorie food intake, increase supplemental vitamin C or vitamin-rich fruits and vegetables, etc., to regulate the endocrine system, to improve the sebaceous glands pigment metabolism abnormality, to alleviate the yellowing of the skin. 2. Laser: If you want to improve, you can do laser treatment, repair the skin effect is very good, laser surgery should be strengthened after the local skin care, good sun protection, to avoid pigmentation. If the chest continues to turn yellow or the symptoms can not be relieved, you should go to the regular hospital under the guidance of the doctor to find out the cause of the disease, active treatment, so as not to miss the condition.