To get rid of dark underarm try this paste using turmeric. Take one tbsp. of honey, 3-4 tbsp. of lemon juice and mix it with 2-3 pinches of turmeric powder. Mix everything well and apply it on your under arm area. Let it stay for 10-15 minutes and then rinse off. Try this remedy daily to get rid of dark underarm area. Use the underarm whitening scrub before using the mask for better results.