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Dark Patches on the Skin (Acanthosis Nigricans): An Early Warning Sign of Diabetes When we think about diabetes, most people picture blood sugar spikes, insulin injections, or dietary restrictions. What many don’t realize is that sometimes the first warning sign of diabetes isn’t in your blood test results—it’s on your skin. One of the most telling dermatological clues is the appearance of dark, velvety patches of skin , often around the neck, armpits, or groin. This condition is called Acanthosis Nigricans (AN) , and in many cases, it’s an early sign of insulin resistance and prediabetes —the stage before type 2 diabetes fully develops. The Link Between Acanthosis Nigricans and Diabetes At the heart of acanthosis nigricans lies insulin resistance , the same metabolic problem that drives type 2 diabetes. Here’s how it works: Insulin’s role → Normally, insulin helps move glucose (sugar) from the bloodstream into your cells for energy. Resistance develops → In some people, c...