Dermal filler injections have some mild side effects that typically resolve within a few days to a week after treatment. These mild side effects include bruising, swelling, or redness at the injection site. Severe side effects from dermal filler injections are uncommon but include vascular occlusions and in rare cases, blindness. Before your dermal filler injection, your LUX Med Spa provider will review your medical history to ensure you are a candidate for treatment.