How to protect your knee and elbow from getting black

How to protect your knee and elbow from getting black 
There are some part of our body which are much important but mostly the skin of elbow and knee get black. How can we get the lighter skin of elbow and knee by using home remedies.By using market products you cannot get light elbow and knee.So, please do not use market products.Instead of relying these products , you can try some simple and easy home remedies to improve the complexion of elbow and knee. These remedies can be easily find in you kitchen and home.
How to protect your knee and elbow from getting black 
Aloe vera
Use aloe vera gel  on elbow and knee. Wash after dry
Milk and turmeric powder
Use the cream of milk and add turmeric powder and massage elbow and knee
Yogurt and vinegar
Mix yogurt and vinegar and massage your elbow and knee for 10 min and then wash