The lip edge is blackened, have hemp feeling, be how to return a responsibility

The lip edge is black and numb, which may be caused by abnormal digestive function and vitamin C deficiency, or may be caused by poor local blood circulation and incomplete kidney function, but it is also suspected to be caused by pulmonary heart disease, heart valve disease, myocarditis, chronic heart failure and other diseases. It is necessary to go to the hospital for cardiac color Doppler ultrasound examination and blood examination to confirm the cause.