Acanthosis Nigricans and Insulin Resistance

Associated Conditions

The American Diabetes Association suggests that obesity and metabolic syndrome are the most common associations with acanthosis nigricans, where excess weight itself causes insulin resistance 1, 2
The presence of acanthosis nigricans in patients with type 2 diabetes mellitus is a common occurrence, and it frequently appears before diabetes is formally diagnosed, according to the American Diabetes Association 1, 2
Polycystic ovary syndrome (PCOS) is another insulin-resistant state associated with acanthosis nigricans, as stated by the American College of Obstetricians and Gynecologists 1, 2
Rare genetic insulin resistance syndromes, such as Type A (insulin receptor mutations) and Type B (anti-insulin receptor antibodies), are associated with severe acanthosis nigricans, as reported by the Endocrine Society 3, 4

The American Heart Association indicates that acanthosis nigricans serves as an important early warning sign for the "obesity syndrome" and its cardiovascular consequences, with active hyperinsulinemia and significant insulin resistance 1
The presence of acanthosis nigricans in an obese patient indicates an increased risk for developing type 2 diabetes if not already present, according to the American Diabetes Association 1, 2
The American Academy of Pediatrics recommends that children and adolescents with obesity (≥95th percentile) or overweight (≥85th percentile) and acanthosis nigricans should prompt diabetes screening 1, 2

The American Diabetes Association recommends fasting glucose and hemoglobin A1c tests to screen for diabetes or prediabetes in patients with acanthosis nigricans 1, 2

The American College of Cardiology suggests that treatment must address the underlying insulin resistance rather than focusing solely on the skin changes, with weight loss through caloric restriction and increased physical activity being a primary intervention 1, 2
The American Diabetes Association recommends metformin therapy to improve insulin sensitivity and optimize glycemic control in patients with acanthosis nigricans and diabetes 1, 2