The general effect of picosecond spot removal will not rebound, but there are many kinds of facial pigmentation, if you don’t pay attention to sun protection after picosecond laser spot removal or the underlying disease is not controlled, then there may be pigmentation or the original pigmentation reappears after treatment. 1. The skin becomes more sensitive and fragile after picosecond laser treatment, and should be strictly sun-protected. After being irradiated by ultraviolet rays, the remaining normal melanin cells in the skin are stimulated, and the synthesis of melanin is increased, so there will be deepening of local pigmentation. 2. If facial discoloration is caused by other diseases such as endocrine system, liver, etc., and the original disease is not controlled or deteriorates again, the factors that induce the formation of discoloration still exist, such as melasma caused by changes in hormone levels, then even after the removal of the plaque by laser, the plaque may still recur again due to these factors. Therefore, it is necessary to strictly protect oneself from sunlight, avoid strenuous exercise and moisturize the skin well within three months after having picoseconds. Facial pigmentation has more causes, it is recommended that patients go to regular medical institutions to clarify the causes of the disease and then symptomatic treatment.