The skin is a very sensitive organ which is most exposed to sun and other environmental pollution. It actually plays the role of a barrier between our inner body and the external environment. It has three layers, which provide sufficient defense from dirt particles to the inner body. Due to exposure to ultraviolet rays emitted from the sun, free radicals are produced in our body. They are highly charged oxygen molecules which get attached to our skin. They attack cells and damage DNA present inside our cells.