Pimples one week after ultra picosecond treatment may be caused by folliculitis, allergy and other diseases that manifest as pimples. 1. Folliculitis: follicle sebaceous gland metabolism disorders, openings blocked, local cleaning is not good, etc. will appear acne. 2. Skin allergy: The repair products used after the ultra dermatoseconds will cause the skin to undergo a metamorphic reaction, which will result in the appearance of pimples, redness, redness, swelling, and intense itching of the skin, which will alert you to the occurrence of skin allergy. For people who have done the ultra-picosecond, it is recommended to do a good job of skin sunscreen, moisturizing work, it is best not to wear makeup within 1 week after the operation, eat less spicy and stimulating food, pay attention to rest, do not scratch the face with your hands. For patients who have acne one week after hyperpigmentation, it is recommended to go to the dermatology department of a regular hospital to clarify the cause of the disease and then actively treat it under the guidance of the doctor.