The principle of 5-day spot removal mask is to use spot water or liquid nitrogen low temperature on the face to extract the spot to the surface layer of the skin, this process is more painful; then apply pure Chinese medicine mask for about 5 days to metabolize and repair the skin; after uncovering the mask, the freckles are adsorbed to the mask and the skin will become tender; finally, repair is carried out, which needs to last for 1-3 months before stopping the color removal. The hazards are as follows: 1. Aggravating melanin deposition: fast spot removal method is the result of treatment in a destructive situation, so attention needs to be paid to the repairing ability of the skin. As the epidermal cell layer is damaged on a large scale, its own repair and UV protection functions are affected, which may aggravate melanin deposition. 2. Dry and cracked skin: Because this method targets the epidermal layer of the skin, it needs to peel off the stratum corneum, which in turn causes water loss, vascular constriction, slow blood flow or bruising when the skin encounters cold environment. If the skin loses its warmth, it will cause skin tightness and wrinkling, and even dry cracking, infection, ulceration, accelerating the aging process of the skin; 3, skin thinning and red blood: this way the epidermal cells of the skin first peeled off, making the skin thin, brittle, and capillary protrusion. When exposed to heat, exercise, emotional excitement, blood vessels expand, blood flow accelerates, so the face red, that is, the common red blood; 4, the skin becomes sensitive: the skin becomes thin and brittle, so the original is not sensitive skin, may also become sensitive.