Reduce friction by wearing loose, breathable clothing
Keep the area clean and dry
Use gentle exfoliation 1–2 times per week
Apply a moisturizer with urea, lactic acid, or ceramides
Use products with niacinamide, azelaic acid, or vitamin C
Consider a mild chemical exfoliant like glycolic acid
Avoid harsh scrubbing or irritating soaps
Maintain a healthy weight if excess friction is a factor
Treat any underlying causes such as eczema, fungal infections, or insulin resistance
Use sunscreen on exposed inner thigh skin
Stop using products that cause irritation or rash
See a dermatologist if the darkening is sudden, severe, or persistent