Hello There are some ayurvedic medicines which can make you more sun sensitive and hence increase exposure to sun without use of sunscreen could have given you a tan. I would recommend use a good sunscreen like Rivela gel sunscreen apply 20 minutes before sun exposure and reapply every 3 hours. For removing the superficial tan please use ban a tan cream on your face every night Hope this helps Best Dr Batul Patel Www.Drbatul.com