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The actual procedure is generally well tolerated, due to the local anaesthesia. You may feel a tugging sensation during treatment as the cannula and substance moves around but you should not feel pain.
People may experience mild swelling, bruising or tenderness, which will be uncomfortable for the first first days post treatment but should resolve in approximately a week. Scars from the points through which the substance is injected are very small and will often fade over a period of months - becoming barely noticeable.