Purple and black color may be caused by heart disease, respiratory disease, liver disease, and other causes. It may also be an individual difference. 1. Heart disease: such as congenital heart disease, heart failure and other heart diseases, can lead to ischemia, lack of oxygen in the body, the symptoms of purple and black face. 2. Respiratory diseases: such as chronic obstructive pulmonary disease (COPD), due to reduced lung function, can cause hypoxia, resulting in purple and black color. 3. Liver diseases: such as viral hepatitis, cirrhosis and other diseases, can lead to changes in facial skin color, which can be manifested as purple and black. The person with purple and black face, excluding individual differences, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, and standardized treatment under the guidance of the doctor.