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Epstein-Barr virus (EBV)-positive mucocutaneous ulcer is a lymphoproliferative disorder occurring in patients due to iatrogenic or age-related immunosuppression confined to the oropharynx, skin, and gastrointestinal tract. Here, we report the first case to our knowledge of EBV-positive mucocutaneous ulcer occurring in a gallbladder. The absence of lactase in the intestinal villi due to mucosal injury or genetic factors causes undigested lactose to reach the colon where it is fermented. Lactose intolerance is diagnosed based on clinical
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