Dark, velvety patches on the neck, armpits, or groin could be more than just a skin issue — they might signal an underlying health problem like insulin resistance or prediabetes. This condition is called Acanthosis Nigricans, and it often shows up in people who are overweight or have high blood sugar levels. It’s not dirt and can’t be scrubbed off.

These patches aren’t harmful on their own, but they can be an early warning sign of type 2 diabetes or other metabolic issues. If you or your child develops these skin changes, especially with symptoms like fatigue or frequent urination, it’s time to check blood sugar levels. Pharmacies offer quick testing, or you can use a home glucose meter.

Not all dark patches are Acanthosis Nigricans — some, like Terra Firma-Forme Dermatosis, can be wiped off with alcohol. A doctor can help identify the cause.

Bottom line: if you notice unusual skin changes, don’t ignore them. Get checked early. Managing weight, eating well, and staying active can help prevent or reduce symptoms.