Acanthosis nigricans is not a disease itself, but rather a warning sign.
Common causes include insulin resistance, obesity, hormonal disorders, genetic factors, and, rarely, medications or tumors.
Children and adults with obesity who develop these patches may have an increased risk of developing type 2 diabetes.
**Diagnosis and When to See a Doctor**
The patches are usually painless and do not itch. Blood sugar tests can help confirm insulin resistance.
A doctor should be consulted if the patches appear suddenly, spread, or are accompanied by symptoms such as fatigue, excessive thirst, or frequent urination.
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