The black spots on the lips may be melanin precipitation, which is irrelevant or it may be spotted polyposis syndrome.

There are many melanosis of oral mucosa, including melanocytic nevus, hemangioma and other local oral lesions, as well as common small intestinal polyp syndrome, accompanied by abdominal discomfort and bloody stool. You can go to the stomatology department for treatment.

Regular smoking will also have an impact on the body's endocrine, so it is very necessary to have a good living habit at ordinary times.

Finally, I wish you good health and happiness.