The doctor said, "If I use glycolic acid, should I wash it off?" The doctor said, "It depends on the situation. If the skin is very sensitive and may feel uncomfortable after use, it should be washed quickly to avoid hurting the skin. If the skin is patient and wants its effect to last for a long time, wait for a while and then wash it off. When using it, you must use it according to the law, in the right amount, and do not exceed it. If the skin is red, swollen and painful after use, quickly wash it with water and seek medical treatment."