| Summary: | Peutz-Jeghers syndrome (PJS) is a polygenic autosomal dominant disease characterized by multiple gastrointestinal polyps and pigmentation of the mucosa and skin. While there are a few reports regarding successful treatment of intestinal polyps in PJS, there is little research regarding treatment of mucocutaneous melanosis. This study investigated the many advantages of using a Q-switched alexandrite laser to treat mucocutaneous melanosis. In this case, a 19-year-old male with PJS presented with labial lentigines and received two Q-switched alexandrite laser treatments in 2018. Subsequently, the efficacy of the treatment was evaluated. The result of the evaluation was that, after the two laser treatments, the labial lentigines were successfully removed, and there were no complications.
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