03/30/2026
Acanthosis Nigricans is a skin condition characterized by dark, thickened, velvety patches, usually found in body folds such as the neck, armpits, or groin. It is not a disease itself but a sign of an underlying problem. The most common cause is insulin resistance, where the body produces high levels of insulin that stimulate skin cell growth.
Hormonal disorders
Conditions that affect hormones—such as thyroid problems or PCOS—can trigger AN due to imbalances in the body.
Medications or underlying disease
Certain drugs (like steroids or hormonal treatments) can cause AN.