Many factors: The darkening of the lips and mucosa could be due to a genetic condition called peutz-jeghers. Which is accompanied by intestinal polyps. Another possibility is dermatitis which is a broad term that refers to skin inflammation due to any number of causes. If your son is a mouth breather dry lips can cause darkening and dry the gums as well. I would see your physician or dentist to check him.
Answered 2/24/2018
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