A. Fillers are usually performed after applying anesthetic cream, but there may be pain as it varies by individual. After filler treatments, bruising, swelling, itching, foreign body sensation, allergic reactions, and pain may occur, but these are temporary symptoms that improve within 1-2 weeks. If you have prescribed medication to prevent inflammation after filler treatment, please take it properly. If symptoms like pain, itching, heat sensation, skin color changes, or hard lumps continue even after taking prescribed medication, please revisit the hospital. Very rarely, side effects such as necrosis, blindness, and allergic reactions may occur during filler procedures, so treatment by skilled medical professionals is necessary.