Azelaic acid can slightly change skin color, but typically not in a drastic way. It works by reducing melanin production, the pigment responsible for skin color, which can even out skin tone and help fade hyperpigmentation like dark spots or melasma.
While it may lighten areas of hyperpigmentation, it's unlikely to significantly alter your natural skin tone.
However, some people may experience temporary skin discoloration or redness at the treated area, particularly in the initial stages of using azelaic acid. This side effect usually subsides with continued use.
