An itchy face the day after a picosecond may be caused by an inflammatory reaction or by skin sensitization. Picosecond is a relatively common medical cosmetic program, after the operation may cause itchy skin manifestation, at this time the patient is recommended to improve under the guidance of the doctor. 1. Inflammatory reaction: The principle of action of picosecond is to break down the melanin under the skin through the energy of laser pulse. This process may cause damage to the skin, forming a local inflammatory reaction, thus causing itching. Patients can apply cold medical mask to improve the situation after the operation. 2. Skin allergy: the barrier function of the skin can be damaged after picosecond surgery, if you eat spicy food or contact with allergic substances may lead to itching of the skin. At this time, the patient to promote the skin barrier repair drugs, such as recombinant bovine basic fibroblast growth factor gel to improve. When the patient picoseconds the next day face itching, it is recommended to go to the regular hospital in time for examination, under the guidance of professional doctors for symptomatic treatment.