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.
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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:
- Darker in color than the surrounding skin, usually in shades of brown or gray.
- Thickened texture , thicker than normal skin.
- Velvety or soft to the touch.
These spots usually appear in body folds, although they can appear in different areas. The most common areas include:
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- The back and sides of the neck.
- The armpits.
- The inguinal region (groin).
- Under the breasts.
- Around the elbows and knees.
- The knuckles of the hands.
Unlike common dirt or dead skin cell buildup, these plaques don’t disappear with washing, exfoliation, or vigorous scrubbing . That’s precisely one of the key indicators for differentiating them from other superficial causes.
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