PCOSInsulin ResistanceSkin Health

More Than a Tan: Understanding Dark Skin Patches and Insulin Resistance

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Florya Medical Team

April 16, 2026 • 5 min read

"Skin changes aren't just about acne. Dark, velvety patches around the neck or underarms (Acanthosis Nigricans) are a powerful sign of an internal metabolic shift, specifically insulin resistance."

When the body becomes resistant to insulin, the pancreas overproduces it. High insulin can stimulate skin cells to grow rapidly, leading to the thickening and darkening characteristic of these patches.

Up to 80% of women with PCOS have some degree of insulin resistance. High insulin also signals the ovaries to produce more androgens, causing irregular periods and hair growth.

Identifying these patches is often the "missing piece" connecting reproductive symptoms to metabolic health and diabetes risk.

Skin Markers

  • Velvety Texture The dark patches feel slightly raised or fuzzy compared to surrounding skin.
  • Specific Locations Patches appearing in the creases of the neck, armpits, or groin.
  • Skin Tags Flesh-colored growths in the same areas as the dark patches.
  • Slow Progression Developing gradually over several months or years.
  • Correlation with Sugar Crashes Noticing these patches alongside weight gain or irregular cycles.
Decoding Data

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