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You’ve probably noticed dark patches on the back of your neck that don’t disappear no matter how much you wash or scrub the area. The most common reaction is to think it’s just accumulated dirt, sweat, or poor hygiene. However, when these marks persist and have a particular texture, they could be indicating something much more serious for your health.

Health
Health
This type of skin lesion has a medical name: it’s called  acanthosis nigricans . Although it doesn’t pose a serious danger in itself, it can serve as an early warning sign that the body is developing insulin-related problems, which in the long term increases the risk of developing type 2 diabetes.

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What is acanthosis nigricans?
Acanthosis nigricans is a skin condition characterized by the appearance of areas with three very recognizable features: