After injection of pseudohyaluronic acid, the reaction time varies from person to person because there is a certain incubation period before the lesion and everyone's physique is different. Some patients have various complications in a short time after injection, and some patients have no obvious symptoms for several years or even decades after injection, but once they have an attack, they will soon have complications such as redness, swelling, pain, induration and purulent skin ulceration. So be careful and take it out after checking.