What's with the dark spots on your lips?

Black spots on the lips consider two reasons: one is melanin abnormal deposition caused by mucosal black spots; second, pigmentation intestinal polyp syndrome, it is a genetic disease, generally no adverse symptoms, but when pigmentation more and more, accompanied by abdominal pain diarrhea and other symptoms, should go to the hospital in time to do stomach, enteroscopy and other related examinations, observe whether there are intestinal polyps, etc., and then carry out the next step of treatment.