Acanthosis nigricans

Oral mucosa echinoderma is mainly hyperpigmentation, hyperkeratosis, and has a rough texture. Skin diseases characterized by dry mouth odor, pulse strings, and verrucous proliferation. Among them are benign black echinoderma, often red tongue, yellow greasy fur, and normal diet. Invasion of the oral mucosa is most pronounced during puberty. It is really rare clinically in stomatology

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