lemon doesn't suits your sensitive skin.
Coconut oil is another good option to get rid of dark underarm. Coconut oil contains the important ingredient Vitamin E that can help in lightening the underarms. Before taking a bathing, daily massage the dark underarms with coconut oil for ten to fifteen minutes. Then rinse the area properly with mild soap and lukewarm water. When this remedy is followed on daily basis, it will reduce the darkening of underarms over time. At the same time, coconut oil will also work as an effective natural deodorant.