A routine commute on the Hyderabad Metro turned into a striking public-health observation for Dr Sunita Sayammagaru, who noticed a common but often overlooked warning sign among fellow passengers—dark, velvety patches on the back of the neck.
The condition, known as Acanthosis Nigricans, is an early indicator of insulin resistance, a precursor to Type 2 diabetes and other metabolic disorders. Dr Sayammagaru said that in a single ride, more than half the people she could observe appeared to show these changes. The pattern cut across age, gender and body type; even individuals who seemed slim from behind often showed central fat distribution when seen from the front.
Not tanning, but a metabolic signal
Dr Sayammagaru clarified that Acanthosis Nigricans is frequently mistaken for tanning, especially in India. The patches can also appear in skin folds such as the armpits, groin and abdomen, and should prompt evaluation rather than cosmetic concern.
Why it matters
Insulin resistance occurs when the body’s cells don’t respond effectively to insulin, causing glucose to remain in the bloodstream. Over time, this can progress to prediabetes and Type 2 diabetes. According to the Cleveland Clinic, early stages may show normal blood sugar, making visible signs like skin changes crucial for early detection.
What can help
Dr Sayammagaru recommends timely lifestyle interventions: cutting down junk food, limiting excess carbohydrates and fats, increasing protein intake, staying physically active, losing excess weight, prioritising sleep and managing stress. She noted that preventive steps taken early can significantly reduce future complications.
The observation underscores how everyday spaces like public transport can reflect wider health trends—and why recognising early warning signs can help avert long-term disease.