The main side effects of non-surgical double chin reduction can depend on the specific technique used to get rid of it. However, in most cases, the common side effects will be along the lines of bruising, redness, swelling and tenderness at the site of the treatment area. This can last for a few days to a week or so. More severe side effects are possible, but extremely rare, like they are with any medication or medical procedure. You will be asked not to take blood thinners for about a week before and after treatments (but please speak with your doctor before stopping any prescribed medications). You also should not do heavy exercise immediately after your treatment sessions. During your consultation, you’ll be given a list of all the possible side effects of the double chin treatment you choose to go with.