Whitening mainly refers to the whitening and moisturizing ecchymosis, which makes the skin white and thorough through physical or medical means. Whitening should conform to nature, and the amount of pigment contained in each person's skin is determined by heredity. Melanin is a protein found in the basal layer of every human skin. Ultraviolet radiation causes melanin to change, creating a substance that protects the skin. Then, melanin moves through the layer of cellular metabolism to the epidermis of the skin, forming skin problems such as uneven spots and uneven skin. Therefore, whitening is also a nursing project from the inside out. Whitening and rejuvenation methods include: collagen skin rejuvenation, photorejuvenation, deep skin rejuvenation, complex color light, color rejuvenation, laser whitening and so on.