Bruising occurs in a significant number of cases.
Swelling in the injection area will occur. This will last for aprox 48 hours
Asymmetry: Sometimes one side is better treated than the other, this is usually because the patient is asymmetrical to start with.
Infection is a very rare complication, but always a possibility when the needle goes into the skin.
Necrosis (blood vessel being blocked, interfering with blood supply to the skin) is very rare. This could lead to scarring.