Hyperpigmentation on the dorsal tongue

Affiliations

• ¹ Department of Diabetes, Metabolism, and Endocrinology, International University of Health and Welfare, Narita Hospital, Chiba 286-8520, Japan.
• ² Department of Pulmonology, International University of Health and Welfare, Narita Hospital, Chiba 286-8520, Japan. Electronic address: y-takeshita@iuhw.ac.jp.
• ³ Department of Diabetes, Metabolism, and Endocrinology, International University of Health and Welfare, Narita Hospital, Chiba 286-8520, Japan. Electronic address: tomoyoshida@iuhw.ac.jp.