The effect of water light on removing spots is not big, the formation mechanism of facial pigmentation is complicated, which can be lightened by drugs and photoelectricity treatment. Hydrographic injection is a kind of injection treatment for hydration and moisturizing. At present, single molecule hyaluronic acid is commonly used as the injection material, and it can be combined with vitamin C injection and glutathione injection to improve the darkness of the face, and it can also be combined with the injection of botulinum toxin A to achieve the improvement of fine lines of the skin and reduction of the pore size, etc. The formation mechanism of facial pigmentation is complicated. The formation mechanism of facial pigmentation is complex, and is currently believed to be related to the increase in melanin secretion of the skin due to a variety of factors, including heredity, sun exposure, endocrine disorders, excessive use of cosmetics, chronic diseases, and so on. Facial pigmentation skin diseases such as sun spots, aggravated freckles and chloasma can be caused by long-term exposure to ultraviolet rays of sunlight, which generates and accumulates a lot of melanin on the face. To sum up, if patients want to remove facial spots, they can strengthen sun protection measures and apply topical hydroquinone cream, arbutin, niacinamide, azelaic acid cream and other creams that promote pigment decomposition and absorption and whitening and brightening efficacy. Serious cases need to undergo laser treatment, photorejuvenation, chemical peeling and other medical treatments, thus helping to effectively get rid of facial spots. Different pigmentation treatment modes are different, and special care is needed to grasp the indications when choosing photoelectricity and drug treatment, as inappropriate treatment modes will lead to deepening of pigmentation, and it is recommended to go to regular medical institutions for treatment under the guidance of specialists.