The reason for purple and black lips may be caused by dark-colored food ingestion, poisoning, serious lung disease, etc. If you want to become natural red, you can treat poisoning, treat lung disease and so on. 1. dark food ingestion: such as mulberry, etc., can be cleared by washing, generally do not need special treatment, and so on the natural metabolism of pigmentation, lip color can be restored to natural red. 2. Poisoning: carbon monoxide poisoning or heavy metal poisoning can make the lips purple and black, if carbon monoxide poisoning, can be treated by hyperbaric oxygen chamber treatment, replenishment of electrolytes, glucose, the use of glucocorticosteroids such as prednisone and other treatments; if it is a heavy metal, such as lead poisoning can be used to use magnesium sulfate, mercury poisoning can be used to use egg whites, milk and so on. 3. Serious lung disease: chronic obstructive pulmonary disease, serious lung infection, respiratory failure can also make the lips purple and black, at this time you can use bronchodilators such as aminophylline, glucocorticosteroids such as prednisone, anti-infective drugs, oxygen and other ways of treatment for lung disease. If you have black and purple lips, you should consult a doctor in time for diagnosis and treatment according to the cause of the disease, and the relevant drugs should be used under the guidance of a doctor.