Hii How to reduce darkness on knees and elbows . He is 7 years old. Attached pictures for ur reference

A. You can make a coffee scrub with coconut oil you can apply that and gently scrap this will help the second thing that you can do is that you should apply a mix of white bread and raw milk flurry which you can apply and leave it for 10 minutes and gently you can scrub which would be a good option