Disclaimer: Common complications Pain, bleeding and bruising at the time of injection. After injection, the area may feel tender but should not be actively painful. If you experience significant pain following dermal filler injection, then you must contact your practitioner as soon as possible for review. Bruising is a common problem; the degree of bruising is dependent on several factors. Most of the time bruising is mild but occasionally can be more significant. Bruising can take up to 2 weeks to fully resolve but should be much improved after 1 week. More uncommonly severe bruising can lead to haematoma formation, a collection of clotted blood. In this case the swollen collection of blood will need at least 2 weeks to resolve naturally and your practitioner will give you the appropriate after care advice. Swelling is another common side effect following dermal filler this is usually mild to moderate but occasionally swelling can be more severe. Swelling is often worse on days 2-3 after injections, it should resolve by 2 weeks but should be significantly improved after 5 days. Sometimes people can faint or feel faint with injections, you must tell your practitioner as soon as possible if you feel unwell during the treatment.