Is it permissible to use a natural soap daily to cleanse the skin, knowing that it might lighten the skin tone with continued use, even though this is not stated on the packaging? And is this considered altering Allah's creation?

A woman is permitted to use creams and natural substances to purify, lighten, and remove melasma from her skin, provided there is no extravagance and no alteration of the original skin color that Allah created. However, if these products lead to a permanent change in skin color from dark to white, then this is not permissible because it is considered an alteration of Allah's creation. This is common with chemical products and surgical procedures that have caused serious illnesses to some of their users.