Wash the area gently every day with a mild cleanser
Exfoliate 1–2 times per week with a gentle chemical exfoliant like lactic acid or glycolic acid
Avoid harsh scrubbing and abrasive loofahs
Use a fragrance-free moisturizer after bathing
Switch to a gentle, alcohol-free deodorant or antiperspirant
Stop shaving too closely; use a sharp razor and shaving gel
Consider waxing or laser hair removal if shaving causes darkening
Wear loose, breathable clothing to reduce friction
Reduce friction from tight sleeves and repetitive rubbing
Keep the area dry to prevent irritation
Treat any rash, itching, or infection promptly
Use products with niacinamide, azelaic acid, or vitamin C if tolerated
Patch test new products before regular use
Maintain a healthy weight if excess friction is contributing
See a dermatologist if the darkening is sudden, thick, velvety, painful, or spreading
Get checked for diabetes, insulin resistance, or hormonal issues if recommended by a doctor