There is currently no medical method that can completely safely and permanently change skin color. Some methods that claim to change skin color have great risks and limitations: - **Chemical peel**: By using chemical agents such as salicylic acid, glycolic acid, etc., the surface layer of the skin can be peeled off, which can improve uneven skin color to a certain extent, but this is an invasive operation and may cause adverse reactions such as skin allergies, increased pigmentation, and thinning of the skin. The effect is limited in duration and is not a permanent change in skin color in the true sense. - **Laser treatment**: Lasers of different wavelengths can target different pigment problems, such as removing spots, and have a certain improvement effect on skin color, but complications such as pigmentation or hypopigmentation may also occur after multiple treatments, and it is also impossible to achieve an absolutely permanent and risk-free change in skin color. Fundamentally changing skin color through methods such as gene editing faces technical difficulties on the one hand, and huge ethical controversy on the other hand, and it is difficult to apply it clinically in the foreseeable future.