Because hyaluronic acid has high water absorption, it is normal to have swelling within 3 days after injection, and it takes about a week for people with sensitive constitution. Just after injection of hyaluronic acid, do not apply hot compress, cold compress or massage without authorization. Try not to touch the injection site for 6 hours, and don't eat spicy food for a week. If there is redness and induration after a week, it is necessary to see an injection doctor.