Kojic Acid
In concentrations of 1-4%, Kojic acid is used to lighten dark areas of the skin. It is also used up to two times per day until the desired lightness is achieved. Kojic acid may be irritating to some, but reduced frequency of application may be helpful in reducing this side effect.
Don Mehrabi MD, FAAD
Dermatologist, Certified by the American Board of Dermatology
Los Angeles, California


