Detailed answer

Body lotion that contains skin brightening ingredients like niacinamide or vitamin C may help reduce the appearance of dark spots on the knees. These ingredients can help inhibit the production of excess melanin, which is responsible for darkening of the skin. Additionally, body lotions that contain exfoliating agents like alpha-hydroxy acids (AHAs) or retinoids can help to gently exfoliate the skin and promote cell turnover, which may aid in fading dark spots over time. However, it is important to note that individual results may vary, and it's always recommended to consult with a skincare professional for personalized advice and treatment options.