Onion and garlic. They are perfect for dark skin. Take a clove of garlic, clean it and finely chop it. Do the same with the onions. Mix the garlic and onion and apply it on the darker areas of your elbows and knees. Rub for 10 minutes, then rinse with water. Then mix one part of glycerin and one part of lime juice and two parts of rose water. Apply the mixture on the place where you applied onion and garlic.
Mint. Take a pot and add some water in it. Boil the water and a handful of mint in it. Simmer for a while, then add the juice of half a lemon. Stop the heat and leave to cool. Soak a cotton pad in the mixture and apply it on the problem areas. Leave on 10-15 minutes, then rinse with warm water.