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Early diagnoses of different papillary lesions are challenging for oral medicine specialists. Malignant acanthosis nigricans (MAN) is a rare cutaneous disorder and a potential marker of underlying hidden tumours. It is characterized by papillary lesions that always involve the oral mucosa. In oral medicine specialities, MAN is not well understood. When the early signs of MAN are extensive oral lesions and slight cutaneous pigmentation without obvious florid cutaneous papillomatosis, the diagnosis can be incorrect or delayed. Oral medicine specialists should ask affected patients to provide details of their medical history and conduct a timely systemic examination.<\/jats:p>","DOI":"10.1111\/ced.14995","type":"journal-article","created":{"date-parts":[[2021,11,9]],"date-time":"2021-11-09T08:55:33Z","timestamp":1636448133000},"page":"651-657","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Malignant acanthosis nigricans and diseases with extensive oral papillary hyperplasia"],"prefix":"10.1093","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2826-7407","authenticated-orcid":false,"given":"Y.","family":"Liu","sequence":"first","affiliation":[{"name":"Department of Oral Medicine Stomatological Hospital Southern Medical University Guangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"X.","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Oral Medicine Stomatological 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