Wash the neck gently twice daily with a mild cleanser
Exfoliate 1 to 2 times per week with a gentle chemical exfoliant like lactic acid or glycolic acid
Apply a moisturizer daily to keep the skin barrier healthy
Use sunscreen on the neck every day
Reduce friction from tight collars, jewelry, or scarves
Maintain a healthy weight if weight gain is contributing
Check blood sugar levels if the darkening is sudden or widespread
Treat underlying conditions such as insulin resistance or diabetes
Use products with niacinamide, azelaic acid, or retinoids if tolerated
Avoid harsh scrubbing or abrasive home remedies
See a dermatologist if the darkening persists, spreads, or is thickened
Get medical evaluation if there is itching, scaling, or a velvety texture
Consider prescription treatments if over-the-counter options do not help