The risks of injectable fillers are minimal. Expected complications include swelling and minor discomfort at the injection site. How long this will last depends on the injectable. Rarely, a person will have an allergic reaction to an ingredient in a dermal filler, which is potentially dangerous. If swelling becomes excessive, does not go down within a week, spreads beyond the injection site, or is accompanied by hives or itching all over your body, contact us right away. To learn more about your dermal filler options, schedule a consultation with one of our facial rejuvenation experts.