In this study, eligible subjects with moderate to severe nasolabial folds will be treated with Princess® VOLUME Lidocaine and will return for follow-up assessments 2, 4, 24 and 36 weeks after the treatment. A Touch-up treatment may be done at Week 2, if deemed appropriate by the investigator.

This is a prospective, open label, multicenter, post-market investigation. Following informed consent and screening, eligible subjects with moderate to severe nasolabial folds will be treated with Princess® VOLUME Lidocaine, and will return for follow-up assessments 2, 4, 24 and 36 weeks after the treatment. A Touch-up treatment may be done at Week 2, if deemed appropriate by the investigator. The performance of the investigational device will be evaluated by the investigator by assessing severity of nasolabial folds using the Nasolabial Folds Severity Rating Scale (NLF-SRS) (4, 24 and 36 weeks after the treatment and in comparison to Day 0), global aesthetic improvement (4, 24 and 36 weeks after the treatment). The subject will evaluate pain intensity associated with the treatment (at Day 0 and at Week 2 (if Touch-up treatment occurred)), and satisfaction with the treatment 4, 24 and 36 weeks after the treatment.

The safety will be evaluated based on occurrence of adverse events, which will be collected throughout the investigation.

Inclusion Criteria:

1. Male or female 18 years of age or older
2. Presence of two fully visible, approximately symmetrical nasolabial folds, with each of the folds scored 2-3 according to the 5-grade Nasolabial Folds Severity Rating Scale (NLF-SRS) as assessed by the investigator
3. Healthy skin in the facial area and free of diseases that could interfere in cutaneous aging evaluation
4. Willingness to abstain from any aesthetic or surgical procedures in the treatment area for the duration of the clinical investigation
5. Written signed and dated informed consent

Exclusion Criteria:

1. Pregnancy, lactation, planned pregnancy or unwillingness to use contraception at any time during the study (for women of child-bearing potential only)
2. History of mental disorders or emotional instability
3. History of allergic reaction or hypersensitivity to hyaluronic acid, lidocaine, or any amide-based anaesthetic
4. Presence of silicone implant or another non-absorbable substance (permanent fillers) in the nasolabial region
5. Facial surgery or implantation of dermal fillers, absorbable and nonabsorbable sutures (thread), laser therapy, dermoabrasion, or botulinum toxin application in the nasolabial region within previous 12 months, or chemical peeling within previous 3 months, or planning to undergo such procedures in the treatment area during the study
6. Presence of infectious, inflammatory, or proliferative lesions in the nasolabial region
7. Cutaneous lesions in the treatment area
8. Known human immune deficiency virus-positive individuals
9. History of allergies against aesthetic filling products and recurrent herpes simplex
10. Tendency to hypertrophic scars and/or keloid formation
11. History or presence of any autoimmune or connective tissue disease, or current treatment with immune therapy
12. Diabetes mellitus or uncontrolled systemic diseases
13. Use of anticoagulant, antiplatelet or thrombolytic medication from 10 days pre- to 3 days post injection
14. Any medical condition which, in the investigator's opinion. prohibits the inclusion in the study
15. Current or previous (within 30 days of enrolment) treatment with another investigational drug and/or medical device or participation in another clinical study
16. Previous enrolment in this clinical investigation
17. Subjects whose participation in clinical trials is prohibited by the Austrian Medical Devices Act (e.g., persons with a legal custodian appointed due to mental disability, prisoners, soldiers and other members of the armed forces, civil servants)

62 screened subjects were treated at least once with the investigational medical device and were included in the SAF.

62 subjects had at least one post-treatment assessment and at least one NLF severity assessment based on the NLF-SRS and were included in the ITT population.

One subject terminated the investigation early after Week 4 due to a clinical investigation plan (CIP) deviation.

36 weeks - Up to 36 weeks after treatment (Day 0)

AEs will be detected at each visit by clinical examination and by asking the subject about the occurrence of AEs. Care should be taken not to introduce bias when eliciting AE information from the subject. In addition, the subjects will be instructed to immediately contact the investigator/study site in case of occurrence of any untoward event between visits.