Mandelic acid is used in the treatment of hyperpigmentation.

Mandelic acid is an alpha-hydroxy acid. It is an extract of bitter almonds. The exact mechanism is not clearly known, but research suggests it may reduce the production of melanin (skin pigment). This is how it works to treat hyperpigmentation, melasma, dark spots, etc.

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them