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Concomitant confluent and reticulated papillomatosis and acanthosis nigricans in an obese girl with insulin resistance successfully treated with oral minocycline: Case report and published work review

Concomitant confluent and reticulated papillomatosis (CRP) and acanthosis nigricans (AN) is rare. We present a case of concomitant CRP and obesity‐associated AN in a 12‐year‐old obese Japanese girl. Curiously, oral minocycline therapy, which has been shown to be effective for CRP, was effective against both CRP and AN. Possible mechanisms by which minocycline could have improved skin lesions of CRP and obesity‐associated AN are discussed. In addition, reports of concomitant CRP and obesity‐associated AN are reviewed. CRP and obesity‐associated AN share common clinicopathological features and some reports have described concomitant CRP and obesity‐associated AN. Together with the observation that skin lesions of CRP and obesity‐associated AN in the present case responded to oral minocycline therapy, these facts suggest a tight relationship or a common pathogenetic pathway between these pathologies.