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Try a natural bleaching agent. The acidic, anti-bacterial and antiseptic properties in some vegetables and fruits allow them to lighten the skin naturally. Potatoes, cucumbers and lemons are three that can help eliminate dark skin under the arms.
Potato - Thinly slice a potato and rub a slice on the dark area. Or, you can grate some of the potato to release the "juice." Apply this juice to your underarms, let it dry 10 minutes and rinse.
Cucumber - Just as you did with the potato, you can rub cucumber slices on the affected area or grate some of the cucumber and use the juice. You can go a step further and add a few drops of lemon juice and some turmeric (enough to make a paste) to the cucumber juice. Apply the paste, wait a half hour and wash off.
Lemon - Rub a thick slice of lemon on the dark area; the fruit will remove dead skin cells and lighten the skin. Follow-up by washing and, if necessary, applying moisturizer. (With continued use, lemons can dry out the skin). Add a small amount of tumeric, plain yogurt or honey to lemon juice to make a paste that can be left on for 10 minutes and then rinsed clean.
Egg oil - Gently massage egg oil on the dark area and leave on overnight; the omega-3 in egg oil promote re-epithelisation (new skin cells) which make the skin smooth and light. Wash in the morning with a pH balanced soap or body wash.