Darkening on both sides of the lips is not normal, it may be caused by pigmentation, bad oral habits, trauma, blood clots or poisoning, etc. It is recommended to go to the hospital for timely examination and treatment.
1. Slow skin metabolism leads to hyperpigmentation, the two sides of the lips may be black, may also form pigmented moles.
2. Frequent lip biting, lip licking, smoking, etc. may be blackened.
3. Those who have suffered trauma or have undergone surgery may have scarring.
4. Poor blood circulation, blood clots, etc. around the lips will be blackened phenomenon, may also be hemangioma and other manifestations.
5. Eating toxic food or drugs may be toxic or allergic to the phenomenon of black lips.