Diabetes Skin Signs: Acanthosis Nigricans, Skin Tags & Early Detection Scanner

Diabetes Prevention · 5 · February 7, 2026

I had a dark patch on the back of my neck for two years. My wife called it a "tan line." My barber probably noticed. I never thought twice about it.

Then I uploaded a photo to Journey for Health's skin scanner. Thirty seconds later, it came back: "Acanthosis Nigricans. High risk. Strong indicator of insulin resistance and prediabetes. Recommendation: Consult endocrinologist for insulin resistance evaluation."

I got a fasting insulin test the following week. HOMA-IR score: 4.1. Anything above 2.5 is insulin resistant. My fasting glucose was still "normal" at 103. My doctor would not have flagged it for another three years — by which time I would have been fully diabetic.

How the Skin Scanner Works

You take a photo with your phone — front camera, back camera, whatever gets a clear image. Upload it. The vision system analyses the image for patterns consistent with six diabetes-related skin conditions:

Acanthosis Nigricans — dark, velvety patches in skin folds. Present in up to 74% of obese patients with Type 2. Often appears years before blood sugar goes abnormal. This is your body screaming that something is wrong while your lab tests say everything is fine.

Diabetic Dermopathy — light brown scaly patches on the shins. Found in 55% of diabetics. Harmless but diagnostic — their presence tells doctors that microvascular damage has begun.

Skin Tags — those small flesh-coloured growths that pop up on your neck and armpits. Strongly associated with insulin resistance. Most people treat them as cosmetic annoyances. They are metabolic warning signs.

Necrobiosis Lipoidica — yellow-brown patches, usually on shins. Can actually precede diabetes diagnosis. High risk flag.

Diabetic Blisters — painless blisters on hands, feet, or forearms.

Xanthomatosis — yellow waxy bumps indicating dangerously high triglycerides with uncontrolled diabetes. Urgent.

It Is Not a Diagnosis. It Is a Trigger.

The scanner returns a risk level (low, medium, high), a confidence percentage, and a specific next step. It does not diagnose diabetes. It tells you to get tested. For the millions of people with undiagnosed prediabetes — and the American Diabetes Association estimates 97.6 million Americans have it — a phone camera and 30 seconds could be the trigger that changes everything.

Take a scan at Skin Analysis. Take the Diabetes Risk Assessment right after.