Dark, velvety patches on the neck, armpits, or groin may not be dirt but a skin condition called Acanthosis Nigricans, often linked to insulin resistance and high blood sugar. These patches can’t be scrubbed off and may feel soft or textured.

Causes include prediabetes or type 2 diabetes, obesity (especially in children), hormonal disorders, genetic factors, and rarely, medications or tumors. Dr. Hafizah Mohamed warns, “If your child or someone you know has these patches, it may be time to check their blood sugar.”

Blood sugar can be tested at pharmacies or with home meters. Early detection of prediabetes allows for lifestyle changes before serious complications develop. However, not all dark patches are Acanthosis Nigricans — conditions like Terra Firma-Forme Dermatosis (TFFD) may look similar but can be removed with alcohol swabs.

See a doctor if patches appear suddenly, spread, become irritated, or if there’s a family history of diabetes. Other symptoms like thirst, frequent urination, or fatigue also warrant testing.

Managing the condition involves a healthy diet, regular exercise, weight control, and avoiding sugary, processed foods. Addressing the root cause is key, while topical treatments may help with appearance.