For nearly a year, a 17-year-old high school student in Hangzhou lived with an embarrassing problem: the skin around her neck was dark, rough, and thickened — and no amount of scrubbing would clean it.
She wasn't dirty. Her body was sending a warning.
The Neck That Wouldn't Wash Clean
The girl, identified only as Xiao Huang, is in her final year of high school: 170 cm tall, weighing 80 kg — overweight. For a year, the skin around her neck had turned dark, rough, and thickened, with her armpits also noticeably darker, looking like grime that had never been washed off.
She scrubbed diligently. She and her family used scrubbing towels and cleansers, even scrubbing harder and harder — but the dark skin only got rougher and darker. Embarrassed by the visible dark neck in summer T-shirts, she finally went to the dermatology department's MDT clinic at Hangzhou First People's Hospital.
Not Dirt: Obesity-Related Acanthosis Nigricans
The examining dermatologist found grayish-brown skin in the folds of her neck, thickened and rough, with a typical velvety texture, plus mild pigmentation in her armpits and groin. Combined with her age, body type, and skin symptoms, it pointed to acanthosis nigricans.
The lifestyle history filled in the rest: Xiao Huang was a devoted bubble tea drinker, loved sweets, had nearly one bubble tea a day, rarely drank plain water, and sat still most of the day with little exercise. Long-term high-sugar, high-calorie intake had slowly pushed her weight up.
Blood tests confirmed the suspicion: abnormal blood glucose, obvious insulin resistance, and high blood lipids — the classic picture of obesity-related pseudo-acanthosis nigricans, a metabolic skin problem increasingly common in adolescents.
Why Bubble Tea "Blackens" the Neck
Acanthosis nigricans is a distress signal from your metabolism. The added sugar and fructose in daily bubble tea constantly pile metabolic burden onto the body, driving insulin resistance.
As the body's sensitivity to insulin drops, the pancreas is forced to pump out more insulin to keep blood sugar stable. The excess insulin then stimulates abnormal growth of skin keratinocytes and heavy melanin deposits — especially in skin folds like the neck, armpits, and inner thighs. The result: a dark, rough patch that no soap can remove.
Doctors note that adolescent acanthosis nigricans is rising year by year, mostly linked to high-sugar diets, sedentary obesity, and lack of exercise. It looks like a skin problem, but it's a visible sign of metabolic disorder — and left unchecked, it can pave the way for fatty liver and type 2 diabetes.
Reversible — If You Act
Xiao Huang's hospital team built a personalized plan combining Western and Chinese medicine. Western treatment focused on regulating metabolism, improving insulin resistance, and controlling oil and sugar, plus topical creams for the neck's pigmentation and roughness. Chinese medicine worked on strengthening the spleen and removing dampness, with internal formulas — and, crucially, a complete lifestyle reset: quit the daily bubble tea, cut sweet drinks, eat lightly, exercise regularly, and control weight.
