Rough and darkened elbows are a common problem. There are several remedies to this problem. Regularly rub lemon on your elbows as lemon juice has a whitening and softening effect. Almond paste mixed with honey or milk, vinegar diluted in water, and warm milk are also good alternatives.
  

1/4 litre of milk mixed with 4 teaspoons of glycerine, 4 teaspoons each of powdered borax and bicarbonate of soda make an excellent lotion for rough skin of elbows. Refrigerate this lotion. Equal parts of rose water and glycerine also has a softening effect. Rubbing elbow skin with kitchen salt can also be very effective.