The dermal filler singfiller subq contains cross linked hyaluronic acid with a concentration of 20.0 mg / ml without ingredients of animal origin, therefore a skin test is not necessary. The filler is biodegradable and non-permanent. The duration of the singfiller subq varies from person to person up to a maximum of 1 year. The complications that can occur are rare and easy to manage, including: swelling, redness, and perhaps some mild discomfort at the injection site. Usually these discomforts disappear only within 2 weeks.