It's the question practitioners keep coming back to, and it deserves a straight answer. Fat dissolving injections (FDIs) are growing in popularity, and with that growth comes increasing scrutiny. Whether you're already offering this treatment or considering adding it to your menu, understanding how to manage complications isn't optional. It's essential.
This guide draws on over 20 years of clinical experience from Dr Almeida, who has worked across 59 countries, to give you a practical, evidence-grounded overview of what complications actually look like, how to manage them, and what you need to have in place to protect your patients and your practice. For a broader overview of the risks involved, see our fat dissolving treatment risks article.
Before we talk about managing complications, we need to agree on what they are.
Clinically speaking, a bruise isn't a complication. But here's the mindset shift that matters: from a patient's perspective, anything that makes them pick up the phone and complain is a complication. And patient dissatisfaction is, by far, the leading source of complaints in published data.
Stat worth knowing: Fat dissolving injection claims increased by 500% in 2021. That figure alone should focus the mind.
Understanding how complications, complaints, and claims relate to each other is crucial for any practitioner offering this treatment. Our complaints and claims in aesthetics guide maps this out clearly, and the claims insights resource puts the 500% rise in context.
Fat dissolving injections work through one of two active ingredients:
Here's the compliance point that every UK practitioner needs to be aware of:
⚠ Important: PPC was banned for cosmetic use in the UK in January 2025 by the MHRA. Any product used in the UK must now rely solely on DCA. This is a significant regulatory change, and not every practitioner is aware of it. (Source: MHRA / JCCP)
If you're unsure whether your current products and insurance cover are aligned with this change, check our cosmetic treatments covered page for clarity.
Most side effects from FDIs are expected consequences of the treatment working, not signs that something has gone wrong. The published data highlights the following:
The key is framing. Practitioners who explain these effects clearly before the first session see far fewer complaints afterwards. This is where your consultation process earns its value. See our informed consent in aesthetics guide for practical guidance on documenting these discussions.
Swelling is not a clinical complication, but it is frequently perceived as one by patients. The solution isn't intervention; it's education. Set expectations at the first consultation. Never promise swelling will resolve within two days. If patients are prepared for it, they'll tolerate it. If they're not, they'll call your clinic in a panic.
Nodules occur in around 15-20% of cases, and more commonly early in a practitioner's experience. If a patient presents with nodules:
Only consider intralesional long-acting steroids after eight weeks, and only under ultrasound guidance. A cautionary note: one case involved excising a nodule, only for the resulting scar to cause more distress than the nodule itself. Patience is the right clinical approach here.
Skin necrosis is the complication practitioners fear most, but it is genuinely rare. If you suspect it:
Most reported cases have resolved fully with prompt, appropriate management. The key word is prompt. Make sure patients know how to contact you post-treatment so that any signs of escalation reach you quickly. Our complaints and claims in aesthetics guide has useful guidance on post-treatment communication protocols.
Dr Almeida's clinical framework is straightforward, and worth treating as non-negotiable:
Right patient. Right area. Right technique.
What this looks like in practice:
For more on how poor patient selection, inadequate training, and incorrect technique drive risk, see our fat dissolving treatment risks article.
Most complications (in the sense that patients experience them) can be prevented not through better technique, but through better communication before the treatment starts. Patients today are searching for information online, and AI tools are increasingly filling that gap. The problem is that they're often doing it badly. Your reassurance, your expertise, and your ability to set realistic expectations cannot be replicated by a chatbot.
At the first consultation, make sure you cover:
Emma Bracchi, Senior Client Services Technician at Hamilton Fraser, has noted: "The consultation is the most important part of the treatment." That applies here more than almost anywhere else.
For guidance on documenting consent discussions, including the NMC's updated position on face-to-face consultations, see our informed consent in aesthetics guide and the broader aesthetic treatment guide.
Claims don't usually arise because something went clinically wrong. They arise because a patient felt unprepared, unsupported, or unheard, and had no clear route back to you when something concerned them.
The things that most commonly leave practitioners exposed include:
The 500% increase in fat dissolving claims in 2021 isn't an anomaly; it's a signal. If you're introducing or expanding FDI treatments, now is the right time to check your cover. Visit our main aesthetics insurance page to review or update your policy.
If this guide has raised questions about your practice or your cover, here's where to go next:
