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Case 24: Darkening around the neck or underarms - Acanthosis Nigricans

Darkening around the neck or underarms that doesn’t wash off? It could be more than just pigmentation This condition is called acanthosis nigricans — where the skin becomes dark, thick, and velvety in texture. It commonly appears on the neck, underarms, groin, elbows, knees, and skin folds, and is usually symmetrical.” The most common cause is insulin resistance, often linked to obesity or PCOS. It can also be seen with certain medications or, rarely, internal medical conditions. It’s not just a skin problem — it can be an early warning sign of metabolic issues like diabetes. Treatment focuses on the cause — weight management and improving diet plan are key. For skin, options include moisturizers with lactic acid, retinoids, chemical peels, and dermatologist-guided treatments.