It can be due to hyperpigmentation lips
. To prevent blackness of the lips
, smoking and chewing, biting or pricking the skin of the lips
should be avoided. The most effective solution for treating dark lips is alexandrite and ND-Yag Q-Switched laser treatment. Please discuss these options with your dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided.