Differential diagnosis of Acanthosis Nigricans

The differential diagnosis of acanthosis nigricans / causes of acanthosis nigricans may include 
Acromegaly
polycystic ovarian syndromes
diabetes
steroids intake
other insulin resistance condition 
kidney carcinoma
bladder carcinoma
esophagus carcinoma
stomach carcinoma 
large bowel carcinoma
Prader Willi Syndrome