10/10/2026
🔵 Dark, Thick, Velvety Skin? It May Not Be Dirt
A dark, thickened, velvety patch around the neck, armpits, groin, or other skin folds may be acanthosis nigricans.
This skin condition is often associated with insulin resistance and may be a warning sign of prediabetes. However, it does not automatically mean someone has diabetes. Hormonal disorders, certain medications, genetic conditions, and other health problems can also cause it.
Do not scrub the area aggressively or use harsh bleaching products. These can irritate the skin without treating the underlying cause.
Talk with a healthcare professional about:
• An A1C or fasting blood-glucose test
• Possible medication or hormonal causes
• Safe treatment for the skin
• Lifestyle changes when insulin resistance is present
Seek prompt medical evaluation if the discoloration appears suddenly, spreads rapidly, or affects several areas—especially in an adult.
Your skin may reveal what is happening inside your body. Pay attention to the signs.