Laser, hydroquinone: The most effective treatment to eliminate hyperpigmentation of the skin is through laser treatment. Other very effective way to lighten skin is by using hydroquinone and or prescription retinoids based creams. Shaving the inner thigh, some creams, laser hair removal are some causes of darkening. Chaffing (rubbing of one thigh agains the other) may be the main reason for hyperpigmentation of thighs.
Answered 9/10/2013
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