HomeHealth & FitnessWhat is Acanthosis nigricans? Causes, symptoms and home remedies for black patches on neck, armpits, elbows

What is Acanthosis nigricans? Causes, symptoms and home remedies for black patches on neck, armpits, elbows

If you ever notice unusual, velvety, or rapidly changing skin patches, especially on the elbows, it could be Acanthosis nigiri. AN is not just a patch of darker skin; it’s a symptom that something deeper may be wrong. Often harmless and linked to insulin resistance or obesity, it can sometimes be serious. Understanding the signs, triggers, and knowing when to worry can make all the difference in early diagnosis and treatment:

December 16, 2025 / 18:31 IST
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Symptoms of Acanthosis nigricans (Image: Pexels)
Acanthosis nigricans isn’t a skin disease per se, but a visible sign that the body’s metabolic machinery might need attention (Image: Pexels)

Acanthosis nigricans, a condition marked by thick, velvety, brown‑to‑black patches of skin, crops up chiefly on body folds like the neck, armpits, and groin. However, sometimes, it shows up on places like elbows, knees and even knuckles.

Acanthosis nigricans isn’t a skin disease per se, but a visible sign that the body’s metabolic machinery might need attention. It is frequently associated with insulin resistance, where the body’s response to its own insulin goes awry.

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Some people assume that dark elbows are simply dirt or friction discolouration. However, if the elbow skin feels velvet‑like, appears suddenly, or spreads, it could be a sign that deserves careful attention.

Also read | Acne, eczema, psoriasis and more: Causes, symptoms and treatment tips for 13 common skin problems

Symptoms of Acanthosis nigricans


Here are signs that must not be ignored:

Velvety, thickened patches: Not just darker, but with a distinct soft texture.