What is the cause of long spots on lips?

Long spots on the lips, we are mainly divided into two types clinically, the first type, we call pigmentation polyp syndrome, this type of patient belongs to an autosomal dominant genetic disease, patients mostly in childhood onset, mainly manifested as sunspots around the mouth. Sunspots mainly involve the lower lip, oral mucosa, can also be seen in the hands and feet, this type of patient often has gastrointestinal polyps, mainly small intestine polyps. Clinically, abdominal pain, diarrhea, or hematochezia may be present, and polyps of the intestinal mucosa may be malignant. Therefore, it is necessary for such patients to undergo frequent colonoscopy to detect polyps malignant at an early stage. For patients with malignant polyps, or patients with severe hematochezia, surgical resection should be considered. There is also a class of patients, his lip black spots are simple lip black spots, this kind of black spots, most acquired, not accompanied by intestinal polyps and foot black spots, this kind of patients are relatively safe, there is no clinical tendency to malignant change.