Patients who have black lips may have heart disease, bronchial asthma, nephritis and other diseases, which need to be treated with medication, dialysis, etc. according to the different causes of the disease, and the active treatment may turn into a normal color. If it is an individual difference, no treatment is needed, and can not change the color of the lips. 1. Heart disease, some patients with heart disease heart function decline, blood can not be normal circulation, long-term ischemia and hypoxia, may appear lips black, you can take medication, such as enalapril, metoprolol and so on. 2. Bronchial asthma, bronchial asthma after the lung respiratory function is impaired, the oxygen content in the blood is low, there is a black lip, you can use drugs under the guidance of the doctor, such as beclomethasone, budesonide, etc.. 3. Kidney disease, patients with kidney disease caused by impaired renal function, the body’s toxins can not be quickly discharged, there may be the case of black lips, generally can be used under the guidance of the doctor’s medication, dialysis treatment, if necessary. Usually need to observe the body symptoms, if there are abnormalities need to consult a doctor in time.