Hi rahul. I'm guessing you live in India..you must have heard of Turmeric (haldi) right? It is a yellow powder used in cooking. Take a pinch of turmeric, mix it with milk and add a few drops of lemon juice to it. Apply this to your face and leave it for 15-20 minutes. Wash it off with water. It will remove sun tan, bring back the original colour of your skin and make it really soft.
No side effects..I have been using this for 5-6 years now. Don't add too much lemon juice..just a few drops.