Apples Apples contain a high level of AHA’s which kills the germs and bacteria that cause these dark armpits. It also exfoliates the skin to eliminate the dead skin cells. Take 1 to 2 apples and mash it properly. Apply this on the affected area and gently massage the skin for few minutes. Leave it for few minutes and then peel off. Clear that area with a wet cloth and repeat the process once or twice a week.