What are the signs of a blocked blood vessel after filler?
Filler is a gel placed under the skin. Rarely, it enters a blood vessel or presses one shut, and the skin that vessel feeds loses its blood supply. The US Food and Drug Administration (FDA) calls this the most concerning risk of filler and lists tissue death, blindness and stroke among the complications reported. The wider picture of where and why it happens is in dermal filler risks, and ordinary swelling and bruising are covered in what is normal after filler. This page covers what to do.
On the skin, a 2021 guideline by Murray and colleagues describes blanching, which means the skin goes pale, then a purple, net-like mottling called livedo reticularis, and grey skin where tissue is dying. The paleness may be fleeting before the mottled pattern replaces it. Later signs are blisters at around 72 hours and skin that darkens or turns black, which reflect tissue that has died.
Pain is the other sign. The same guideline says sudden pain that escalates during treatment, at the injection site or away from it, is not normal. It also says numbing medicine can hide pain and pain is not always present early. In a 2024 review of 365 published cases of filler-related vision loss, pain was recorded in about 31% of cases and skin changes in about 73%, so neither sign is present every time.
Doctors also press the skin and watch how fast the colour comes back, which is called capillary refill. The guideline gives under two seconds as normal and treats a longer time as a sign of poor arterial blood supply. A person at home cannot judge this reliably, which is one more reason to be seen.
How soon can it happen?
Usually during the injection or within a few hours. The Murray guideline says the changes typically occur instantly or within a few hours, and on rare occasions a few days later, for reasons that are not fully understood. A 2020 Australian consensus says a vascular occlusion can appear up to 72 hours after treatment. For vision, Walker and colleagues (2021) describe three patterns: acute, from immediate to minutes; delayed, from 1 to 24 hours; and late, from days to weeks.
This is why the Murray guideline advises assessing a patient for 30 to 45 minutes after injecting high-risk areas such as the nose, the glabella (the area between the eyebrows) and the forehead.
Which signs mean the eye is involved?
Loss of vision in one eye, blurred or double vision, eye pain, a drooping upper lid (ptosis) and reduced eye movement (ophthalmoplegia). Walker and colleagues call sudden loss of vision together with eye pain the signature of an embolism around the eye, and list headache, nausea, vomiting and stroke-like symptoms as other possible signs, singly or together. The 2020 Australian consensus says patients should be told about these warning signs: eye pain, double vision and blindness in one or both eyes.
The skin may not look different. Skin changes were recorded in about 73% of the cases in the 2024 review, so they were not recorded in the rest. Do not wait for the skin to change before acting on an eye symptom.
The retina is the light-sensing layer at the back of the eye, and it tolerates a lost blood supply poorly. The Australian consensus says retinal circulation should be restored within about 60 to 90 minutes, and the Murray guideline cites more recent research suggesting retinal damage in as little as 12 to 15 minutes. Time matters.
What should you do in the first hour?
Do not wait to see whether it settles. Contact the doctor who injected you at once. The Australian consensus says patients should receive written aftercare with after-hours contact details and should report any visual disturbance or increasing pain right away. The Murray guideline says a suspected occlusion needs an urgent face-to-face assessment.
If your vision has changed or your eye hurts, go to a hospital emergency department now, and do not wait for a call back. Call 999 if you cannot get there safely; the 999 line is for genuine emergencies and connects the police, fire, health, civil defence and maritime agencies. The 2021 consensus on filler-related vision loss says the clinician must act swiftly and arrange immediate transfer to an emergency department or eye hospital, and strongly recommends that the treating clinician goes with the patient.
Tell the emergency team that you have had filler, when, where on the face, and which product if you know it. Signs of a stroke, such as sudden trouble speaking, a drooping face or weakness on one side, are also an emergency, as the FDA advises.
What should you not do on your own?
Do not wait. Do not rely on ice: the 2020 Australian consensus does not recommend ice after injection because cold can hide the early signs of an occlusion. Do not use massage, heat or tablets in place of being seen.
The Murray guideline lists firm massage and heat among the steps for the treating doctor, and suggests aspirin while stating there is no direct evidence for it. The 2019 consensus advises against giving blood-thinning medicines such as aspirin or heparin at the bedside, because the blockage is not a clot at first. The sources therefore disagree on medicines, which is a reason not to start any of them on your own.
What does the doctor do?
For hyaluronic acid (HA) filler, the published guidance centres on hyaluronidase, an enzyme that breaks HA down. The Murray guideline recommends a high-dose, pulsed approach to the whole affected area, notes that complex cases can need hours of repeated doses, and says the doctor should keep reviewing the patient: next-day follow-up after a promptly treated occlusion, and follow-up until healing if the skin breaks down. The 2019 consensus says every clinic injecting filler should have hyaluronidase available, and that treating the skin must not delay transfer when the eye is involved. Other supportive measures differ between the guidelines and are the treating doctor's decision.
For vision symptoms the main task is transfer to people who can treat the eye. The 2021 vision-loss consensus sets out one pathway for clinicians who are not eye specialists and another for ophthalmologists (eye doctors), and says current evidence does not support hyaluronidase injected behind the eye. The 2024 review found that 68.2% of the cases with a recorded outcome had no recovery of vision, and that no treatment was significantly linked to improvement. That is the reason the sources put so much weight on speed and on prevention.
What if the filler is not hyaluronic acid?
Hyaluronidase acts on hyaluronic acid. The 2019 consensus describes it as useful only when hyaluronic acid filler is the known cause, so the emergency team needs to know exactly what was injected. Ask the clinic for the product name and keep any box, label or treatment record. The slower problems, including how and when HA filler is dissolved, are explained in filler gone wrong: lumps, late swelling and dissolving.
What should you ask before filler in Malaysia?
Four questions are worth asking. Which filler is it, and can it be dissolved? Does the clinic keep hyaluronidase on site, and what is its plan if a vessel is blocked, including after hours? The Australian consensus says practices should keep hyaluronidase on hand and give written aftercare with after-hours contact details. Who is injecting? And is the product registered?
On the doctor, the Ministry of Health's 2020 Guidelines on Aesthetic Medical Practice list filler injection, excluding silicone and fat, among the minimally invasive procedures, and name a clinic as the place where it is done. The doctor must be fully registered with the Malaysian Medical Council, hold a current annual practising certificate and a Letter of Credentialing and Privileging (LCP) for the procedure, and work in a facility licensed or registered under the Private Healthcare Facilities and Services Act 1998. The Ministry asks the public to check the procedure, the practitioner and the premises. On the product, the Medical Device Authority's public register says a device that does not appear in its results is unregistered, expired, suspended or cancelled. Clinic or salon: what must be in the room before an injection sets out each check.
After the emergency: reporting it
Once the emergency is over, a side effect can be reported. How to report a side effect in Malaysia explains which agency takes which kind of report, including the Medical Device Authority for devices such as fillers, and what to keep.
Where does The Retreat Clinic fit?
The Retreat Clinic is a doctor-led aesthetic clinic in Setia Alam, Shah Alam, and it offers dermal fillers placed by Dr Ong Jin Khang. It is an aesthetic clinic and not an eye hospital, so a change in vision belongs in a hospital emergency department and with an eye doctor.
This problem is rare, and it is one of the few that cannot wait.
