http://articles.timesofindia.indiatimes.com/2012-07-03/beauty/31330949_1_juice-skin-aloe-vera
Mixing together some gram flour, lime juice and some curd on the affected area on a regular basis gives best results against tanning.
(Note from me:) Read curd as yogurt. Indians tend to think that curd and yogurt are synonyms.
http://www.knowabouthealth.com/6-quick-natural-tips-to-treat-sun-tanning/1524/
Yoghurt + lemon bleach: Mix yoghurt with lemon juice and apply it on your skin daily before bath. This is one of the best remedy for reducing sun tan.
http://naturalremediesforcure.blogspot.in/2012/12/natural-ways-to-remove-sun-tan.html
Lemon juice is citric acid that helps remove the tan and the cucumber and rose water are cooling agents.
Apply yogurt on the areas affected by sun tan. Yogurt is very effective in reducing sun tan. You can apply yogurt on your skin daily. For better results add tomato juice in yogurt. Tomato juice can be also applied alone to treat sun tan.
http://www.speedyremedies.com/tips-and-homemade-recipes-for-removing-sun-tan.html
Prepare a face mask by mixing a tablespoon of gram flour, two teaspoons of yogurt (preferably sour) and a few drops of lime juice.
Apply this paste on your face and wash it off with lukewarm water after 20 minutes. Follow this therapy two to three times in a day. In case you do not have yogurt, use raw milk.
Is it true that lemon and yogurt have something to do with the tan removal?
Have any studies been done on this?