Underarm darkening or hyperpigmentation may be caused by a number of factors such as genetics, hormonal imbalance, tight clothing and friction of skin rubbing against the other. However, among the major causes are plucking and shaving. Shaving removes layers of skin and leaves minute nicks and cuts, making it vulnerable to skin irritation which leads to darkening. Likewise, plucking leaves the skin red and irritated, which eventually leads to darkening.

The most effective and worry-free option to prevent underarm darkening is laser hair removal. This is expensive yet worth the time and money. But for those who prefer the less expensive route, your best bet is to have a underarm diamond peeling at least once a month. Switching to a milder underarm deodorant also helps. Choose products that contain sunflower seed oil which is a rich source of lipid and water barrier on the skin to protect it from damage caused by hair removal. Wear sleeveless blouses more often and use an underarm night cream.