Clean the neck daily with a gentle cleanser
Exfoliate 1 to 2 times per week with a mild chemical exfoliant
Moisturize the neck regularly
Apply sunscreen to the neck every day
Avoid friction from tight collars, chains, or repeated rubbing
Maintain a healthy weight if darkening is linked to skin folds
Use products with niacinamide, vitamin C, azelaic acid, or lactic acid
Patch test new skincare products before regular use
Treat underlying causes such as insulin resistance, diabetes, or hormonal issues
See a dermatologist if the darkening is sudden, thick, itchy, or persistent