What the Skin Changes Mean
Dark, velvety patches on the neck, armpits, or groin may look like dirt but can signal Acanthosis Nigricans, a skin condition often linked to insulin resistance and high blood sugar.
These patches can’t be scrubbed away and aren’t caused by poor hygiene.
Causes and Risk Factors
Acanthosis Nigricans isn’t a disease itself—it’s a warning sign.
Common causes include insulin resistance, obesity, hormonal disorders, genetics, and rarely medications or tumors.
Children and adults with obesity who develop these patches may face a higher risk of type 2 diabetes.
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