There are a lot of ways to protect your dark underarms. One of the most effective solutions for dark underarms is waxing. It will get your hair removed right from the roots making the area whiter. This will work as a method of exfoliation. Another good remedy for your dark underarm is lemon juice. In order to get them a shade whiter, you should rub the lemon on your armpit and you will be benefited by the natural bleaching by the lemon.
Lightening masks can also be a good idea. You can prepare a mask at home as well. You could take some gram flour with yoghurt and mix it with a little bit of turmeric powder and lemon. The mixture will be very good getting your underarms lightened. Potato could be a good option for getting your skin lightened as well. These are some of the ways by which you can keep away from dark underarms.