As with all cosmetic treatments, side effects may occur following treatment. These will all be fully discussed during your consultation. The most common side effect from Ultherapy treatment is redness in the treated area. This will subside a few hours after treatment. Some patients may also experience swelling, tingling or tenderness but these are mild and temporary in nature. Other, less common side effects may include temporary bruising or numbness on small areas of skin which your practitioner will review with you.