The sudden growth of a black spot on the lower lip may be related to localized hyperpigmentation and moles, which can be relieved by choosing medication, chemical peeling and laser treatment with the doctor. 1. Localized pigmentation Medication: Patients can take tranexamic acid to inhibit melanin formation and inflammatory reaction, which can also promote the repair of local skin barrier. Topical retinoic acid cream, such as adapalene, can also be used to promote epidermal cell renewal and remove localized dark spots. Chemical Peels: Patients can apply peeling agents to the dark spot areas of the skin through fruit acid peels, and then promote metabolism and reconstruction of the epidermal cells through chemicals that act on the superficial layers of the skin with controlled damage. Laser treatment: For the phenomenon of sudden growth of black spots on the lower lip, you can also use laser treatment, thus promoting the fading of subcutaneous melanin. 2. Moles: caused by local melanocyte proliferation, laser can be used to vaporize the skin lesion tissue to achieve the effect of removal. Lower lip suddenly grew a black spot phenomenon, it is recommended to timely to the hospital, follow the doctor’s instructions for standardized treatment.