Modern laser treatment of pigmented skin problems has achieved almost perfect results. Generally speaking, the laser treatment of nevus OTA, freckles, senile plaques and blue-black tattoos is ideal, but the treatment effect of chloasma and post-inflammatory pigmentation is not good. Therefore, before the treatment, please ask the dermatologist to make a complete evaluation for you, and know the treatment cost and postoperative precautions in detail, so as to avoid the result of "spending money to suffer indignities" because of the great gap between ideal and reality.