Dark underarms are a common problem that many women face. Many fair-skinned women too have dark underarms which make them self-conscious of their appearance when wearing sleeveless tops and raising their arms. People claim that rubbing lemon juice potatoes and cucumbers (due to their bleaching effect) coconut oil massages (due to their vitamin E content) have helped lighten the skin on their underarms. However these remedies may not work for everyone as the cause of dark underarms varies from person to person. Dr Kiran Lohia a dermatologist lists out a few of them: Cause #1: Lots of friction will always