Complications after a filler treatment are rare but not impossible. Anyone who has received a hyaluronic acid or other injectable filler should know which observations warrant immediate medical attention — and which are part of the expected reaction. This article is not a triage guide. It is orientation: when in doubt, a reason to contact the treating practice directly.
Note: no self-diagnosis
Symptoms after an injection can have many causes — from harmless tissue reactions to rare, serious complications. The only reliable judgement is medical. What this article does: describe phenomena whose appearance suggests a call to the practice. What it does not do: replace examination, history, or treatment decision.
A systematic review by Urdiales-Gálvez et al. (2018) in Aesthetic Plastic Surgery describes complications in HA filler treatment and stresses: rapid medical assessment is the most important factor in damage limitation [1]. For this reason: at any doubt, contact the practice — do not wait, do not research online, do not hope.
What belongs to expected reactions
Some observations after a filler treatment are expected and not cause for concern:
Slight swelling at the treatment site in the first 24–72 hours. Discrete bruising at injection points. Localised tenderness. Mild tightness. Small asymmetries during the first 14 days — the material continues to settle.
These phenomena usually subside within one to two weeks. A serious practice discusses them before treatment. They are documented, expected, and not in need of intervention.
What requires prompt medical assessment
Other observations require direct contact with the practice — ideally the same day, in acute cases immediately. No self-diagnosis, no waiting:
Strongly unusual, intense, or increasing pain — particularly pain clearly beyond what was felt during the procedure itself.
Skin discolouration spreading away from the treatment site or showing a streaky, whitish, bluish, or mottled pattern.
Visual disturbances of any kind — however discrete. Even unspecific changes in eye perception after a facial injection are a compelling reason for immediate contact.
Sudden, marked swelling that increases substantially within a few hours.
Unusual skin changes such as blister-like, ulcer-like, or necrosis-suspicious areas.
Sudden numbness or muscular movement restriction not attributable to a planned botulinum toxin treatment.
Allergic reactions with breathing problems, rash, or circulatory symptoms — emergency, immediate emergency call.
Late reactions — days to weeks after treatment
Not all complications appear immediately. A review by DeLorenzi (2014) in the Aesthetic Surgery Journal describes delayed filler reactions that can become visible weeks to months after injection [2]. Possible observations to clarify medically:
Nodule formation in the treatment area that does not respond to pressure or massage.
Recurrent swelling correlating with infections or physical strain.
Skin discolouration developing only weeks after treatment.
Increasing asymmetries still visible after three weeks.
Here too: assessment is medical. Late reactions are often well manageable — but only if seen promptly.
Granulomas and inflammatory late reactions
A particular subgroup is inflammatory nodules, called granulomas. They can appear months after a filler treatment and often result from immune reaction to the material or biofilm colonisation. A review by Sclafani and Fagien (2009) in Dermatologic Surgery describes diagnostic criteria and therapy options [3].
Practically: a newly appearing, tender, reddened nodule weeks or months after treatment belongs in medical assessment. Self-massage, pressure, or home remedies are not therapy — and may worsen the course.
What a practice should do when you contact them
A serious practice takes every call after a complication seriously. Standard procedure:
Telephone first assessment — a rough classification of observation as expected or unusual.
Appointment offer for examination — same day for acute symptoms, short term for subacute courses.
Clear instructions on what to do and avoid until the appointment.
If these three points are not met — if the practice deflects, postpones, or only offers an appointment in weeks — that is a warning sign. More in our article on provider red flags.
Why hyaluronidase availability is central
With a hyaluronic acid complication, hyaluronidase is the most important emergency substance. A practice without it on hand cannot respond appropriately to acute filler complications. That is not a detail, but a baseline requirement. More in our article on hyaluronidase emergency use.
FAQ
How frequent are serious complications?
With correct indication, technique, and material, very rare. Most physician-performed filler treatments proceed without relevant complications. That does not change the need to be prepared for the rare case.
Should I keep contact with the practice after every treatment?
With anomalies — yes, immediately. Without anomalies, a routine follow-up after 14–21 days is sensible to assess the result.
Can I contact a different practice after a complication?
For emergencies: any medical practice with experience in filler complications, or an emergency department. For non-acute questions: primarily the treating practice that placed the material — they know the lot, location, and history.
Which symptoms are not cause for concern?
Brief swelling, small bruises, mild tenderness in the first days — all expected. This article does not replace individual medical assessment.
How do I distinguish normal from unusual swelling?
Normal swelling is symmetric, painless or mildly tender, subsides over 48–72 hours. Unusual swelling is asymmetric, painful, increasing, or accompanied by skin discolouration. When in doubt: call.
What if the practice is not reachable?
A serious filler practice has reachability outside opening hours. If unreachable: nearest emergency department or out-of-hours medical service, noting the recent filler treatment.
Should I send a photo at every doubt?
Helpful for the practice's first impression — but does not replace examination. A photo can supplement the call, not replace it.
Acute? Contact the treating practice immediately — no self-diagnosis. § 9 HWG (German Medicines Advertising Act) prohibits remote diagnosis. This article does not replace medical judgement.
References
- [1] Urdiales-Gálvez F, Delgado NE, Figueiredo V, et al. Treatment of Soft Tissue Filler Complications: Expert Consensus Recommendations. Aesthetic Plastic Surgery. 2018;42(2):498-510. PubMed: 29305709
- [2] DeLorenzi C. Complications of injectable fillers, part 2: vascular complications. Aesthetic Surgery Journal. 2014;34(4):584-600. PubMed: 24692598
- [3] Sclafani AP, Fagien S. Treatment of injectable soft tissue filler complications. Dermatologic Surgery. 2009;35(Suppl 2):1672-1680. PubMed: 19807755
Last reviewed: May 2026. This article does not replace medical advice. Individual results may vary.
