Skin necrosis after filler: recognition and avoidance
How ischaemic necrosis develops after filler injection, what the early signs look like, and why the first hour decides the outcome.
Skin necrosis after filler is the visible end of a process that started, silently, at the moment of injection. Understanding the sequence is what makes early intervention possible.
The sequence
Filler enters an artery. It travels — forward with flow, or retrograde if injection pressure exceeds arterial pressure — and lodges where the vessel narrows. Downstream tissue loses its supply. If collateral circulation is adequate, nothing happens. If it is not, the tissue becomes ischaemic, then infarcts.
Timing follows a recognisable pattern:
- Immediate. Blanching in the distribution of the vessel, not the shape of the injection. Pain that is disproportionate — or absent, since ischaemic tissue loses sensation.
- Minutes to hours. Dusky, reticulated, net-like mottling. Sluggish capillary refill.
- Hours to days. Blistering, then black eschar over the territory that died.
- Weeks. Separation of the eschar and scarring.
What distinguishes it from bruising
This is the discrimination that matters clinically, because bruising is common and occlusion is not.
Bruising is red-purple, follows the trauma of the needle, is not painful out of proportion, and has normal capillary refill. Occlusion produces pallor before it produces colour, follows an arterial territory that may extend well beyond the injection site, and shows delayed or absent refill. Reticulated mottling is close to diagnostic and does not appear in a simple bruise.
The first hour
Management for hyaluronic acid is hyaluronidase, flooded through the affected territory rather than dabbed at the entry point, and repeated. Published protocols describe a high-dose pulsed approach, with case series reporting cumulative doses running into thousands of units across a course, continued until perfusion returns rather than stopped at a fixed number.
Adjuncts described alongside it: warmth, gentle massage to encourage flow, aspirin per local protocol, and daily photographic review.
An important finding from the case literature is that late intervention still works. There are documented recoveries where treatment began well outside the theoretical window, with complete epithelialisation and no scarring. A delayed presentation is a reason to start immediately, not a reason to conclude that the opportunity has passed.
Where there is no antidote
Calcium hydroxylapatite, poly-L-lactic acid and permanent fillers cannot be dissolved. Management is supportive while the tissue survives or does not. That asymmetry is the single strongest practical argument for using reversible product in regions where the published record shows repeated events.
