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Definition  

Acanthosis nigricans is a skin condition in which brown or black velvet-like markings appear under the arms, in the groin, or on the back of the neck. Any skin fold can be affected, including the lower lip and chin.

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Causes  

Causes of acanthosis nigricans may include:

  • High insulin levels in people who are obese
  • A family history of acanthosis nigricans
  • A cancerous tumor—rare
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Risk Factors  

Acanthosis nigricans is more common in people of African-American decent. Other factors that increase your chances of getting acanthosis nigricans include:

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Symptoms  

Symptoms include velvety-looking, dark areas anywhere on the skin.

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Endoscopy  
Endoscope in stomach

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Diagnosis  

You will be asked about your symptoms and medical history. A physical exam will be done.

Your bodily fluids may be tested. This can be done with:

Your bodily structures may need to be viewed. This can be done with:

  • X-rays
  • Endoscopy
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Treatment  

Treatment often involves treating the underlying cause. For example, if acanthosis nigricans is due to obesity, weight loss can improve the skin condition.

Topical and oral retinoids and other medications have been reported to improve appearance in some cases. They help remove excess layers of skin.

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Prevention  

To reduce your chances of getting acanthosis nigricans, take these steps:

  • Maintain a healthy weight
  • Eat a balanced diet
  • Get regular exercise most days of the week
  • Talk to your doctor about your blood sugar levels