Armpit sweating that causes clothes to turn yellow is called chromhidrosis, and most chromhidrosis is generally yellow sweat. The yellow sweat in the armpit is caused by the sweat glands as well as the small sweat glands, of which about 10% of normal sweat glands can secrete a small amount of pigment, most of which are yellow. It is thought that the cause of yellow sweat is probably due to dysfunction of the sweat glands or bacterial pigmentation of the armpit area. Yellow sweat is caused by dyes or pigments on the surface of the skin. Yellow sweat is also caused by other diseases, such as hepatobiliary diseases, hepatitis, biliary stasis or bile duct stones, etc. In addition, hemolytic anemia can also cause yellow sweat. Another condition is eating too much yellow pigmented food, such as carrots, oranges, tangerines, etc.