Oweli Liver Detox Ulcers in diverse components of the mouth or on the tongue display that infection or ulceration is going on within the corresponding components of the GI tract. For example, a mouth ulcer at the out of doors elements of your lower lip factors to the presence of ulcer lesions in the big intestine. Herpes ('bloodless sores') at the lip corresponds to greater severe irritation and ulceration of the intestinal wall.