On monday 3/8/15, I forgot to wear a sunscreen and was in sun for quite long around 5-6 hours. When I returned home, I saw that my skin had become very tan which is making me worry. Will I get my original skin colour back? will the sun tan go? if yes, than how long will it take to get back my skin colour back?

Actually all the sunscreens work for 3-5 hours only (depending upon exposure to the sun). You will surely get back your original color soon. To be on a safer side, try the below given homoeopathic creams: Whitening cream (Biovalley) apply in circular motion in the morning and at night. Whitening soap (Biovalley) wash face with this face wash before applying Whitening cream. Suncare cream (Bakson) apply 30 minutes before going outside and again reapply after 3-4 hrs after washing with Whitening soap.