Is there a connection between skin quality and insulin resistance that I should know about?

Three visible skin signs are clinical markers of insulin resistance that general physicians may not emphasize to men: acanthosis nigricans (darkened, thickened skin at the neck, armpits, and groin, a direct effect of insulin's keratinocyte growth-factor signaling), skin tags (multiple fibrous skin tags in similar locations are a sensitivity signal for hyperinsulinemia), and acrochordons, all of which appear years before HbA1c rises into the diabetic range (Hermanns-Lê & Piérard, Eur J Dermatol, 2004).

In my clinical practice, I see men who have been unaware for years that the darkened skin at the back of their neck or the cluster of skin tags under their arm were their body's dermatological distress signal for metabolic dysfunction. These are not cosmetic complaints, they are clinical findings that indicate fasting insulin, HbA1c, and a full metabolic evaluation are appropriate.

Honesty Scale: Solid (1) for acanthosis nigricans as a marker of insulin resistance. This is established dermatological and endocrinological teaching.

What to do: Look at the back of your neck in a mirror. If the skin there is noticeably darker or thicker than surrounding areas, combined with skin tags in your armpits or groin, ask your physician for a fasting insulin level, fasting glucose, and HbA1c. Do not accept "it's just a tan" as the explanation.

For the full picture, read The Skin Health Deep Dive

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