Hi can my 11 year old son use kojic soap zero pigment to lighthen her skin?

Kojic applied to skin reduces melanin production so it can lighten skin, however melanin helps to protect from sunburn. Lighter skin is valued in many Asian counrties, whereas skin tanning is practiced in Europe and North America. Kojic acid concentration in soap must be low, and thus safe, but would not advise use in children because of need sun protection & question whether it is worth it!