377, also known as phenethylresorcinol, has the effect of whitening and brightening skin tone. The spots are usually formed by melanin deposition on the surface of the skin, which is more stubborn. 377 skin care products can achieve the purpose of light spots, but the degree of lightening varies from person to person, and it usually takes a long process to get rid of spots completely. 377’s whitening and light spot principle is mainly to prevent melanin formation from the root, due to the nature of 377 itself is easily soluble in oil, which is more conducive to penetrate into the basal layer of the skin and disintegrate The main effect of 377 is to inhibit melanin secretion, anti-oxidation and improve uneven skin tone, which has been widely used in skin care products. To achieve the effect of spot reduction through 377, it usually takes a long time, therefore, laser irradiation, hyaluronic acid injection, hydrophobic injection and other methods can be used to achieve the effect of spot reduction faster. Although 377 does not have strong irritation, you should pay attention to do allergy test when using it for the first time, take a small amount and apply it behind the ear or on the inner side of the forearm, and observe whether there is redness and itchiness on the application area after 1-2 hours. If there is no abnormal reaction, then use it on the face; if there is itching, burning, red spots and other discomfort, wash it off immediately, and those with serious allergies need to seek medical attention as soon as possible.