With injectable treatments like dermal fillers, a topical anesthetic may be applied to numb the injection area, despite many dermal filler injections containing lidocaine, which is a mild anesthetic. Most patients experience minimal discomfort both during and after dermal filler injections. Mild bruising as well as redness and swelling may occur at the injection site but will typically disappear within a few days. While results will vary from person to person and depending on which area of the face was treated, results can typically be seen within 24 to 48 hours after treatment.