Acanthosis Nigricans

     
Neck region

  Def
Hyperpigmentation

 Colour - brown black velvety

            Location
            Body folds
            Axilla groin
            Armpit

 Age
Less than 40yr

           Histopathology
           Characteristic - paillomatosis +nt
           But.  Hypermelanosis  -nt

Association
trick  the (Da) HBO
      D - diabetes(insulin resistance)
      A- adenocarcinoma (gastric)
      H- hypothyroidism
      B - bloom syndrome
      O- obesity (MC)

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Arm pit region 

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