Vascular Occlusion After Filler: Warning Signs and What to Do
Medical Director Dr Sin Yong explains how a blocked vessel after filler shows itself, why it is an emergency, how it is treated, and what any clinic should have ready.
WhatsApp to Enquire →Key facts ↓Vascular occlusion after filler happens when product enters or presses on an artery and cuts off blood flow to the skin. Warning signs are blanching, severe or increasing pain, and mottled or dusky skin; any change in vision is an emergency. It is rare. With hyaluronic acid filler, prompt treatment with hyaluronidase can restore blood flow, so contact the treating clinic immediately.
- How rare: in a survey of 370 dermatologists reporting 1.7 million syringes, occlusion occurred about once per 6,410 syringes injected by needle and once per 40,882 by cannula [1].
- Outcome: in the same survey, 85 in 100 occlusions had no long-term effect [1].
- Vision: 48 new cases of filler-related vision loss were published worldwide in 2015–2018; about four in five involved hyaluronic acid, and 10 of the 48 recovered vision fully [2].
- Where: an earlier review of 98 cases found the glabella, nose, nasolabial folds and forehead were the commonest injection sites before vision loss [3].
- Speed matters: one published protocol repeats high-dose hyaluronidase until capillary refill, colour and pain recover; its author reported no skin loss when it was started within two days [5].
What is vascular occlusion after filler?
Vascular occlusion is a blockage of blood flow caused by filler entering an artery or pressing on it from outside. The skin that artery supplies is starved of oxygen until flow returns.
It can happen in two ways. Product can be injected into a vessel and travel along it as a plug (embolism), or a deposit placed next to a vessel can squeeze it shut (compression). Both cause the same early signs, and both are treated urgently [4]. The word “necrosis” that appears in search results describes what can happen to skin if the blockage is not relieved; it is the outcome that early treatment aims to prevent, not an inevitable result.
Vascular occlusion is one of the early complications in the international consensus on hyaluronic acid fillers [6]. It sits alongside the far commoner, harmless effects such as swelling and bruising, which is why knowing the difference matters. For the wider picture of early and late problems, see the filler complications overview.
When to seek urgent help
These signs can mean that filler is blocking or pressing on a blood vessel. They are uncommon, but they need action the same hour, not the next day.
- Skin that turns pale or white (blanching) during or soon after the injection
- Severe pain, or pain that keeps increasing, rather than settling
- Mottled, dusky, blue-grey or purple patches, often in a net-like or branching pattern
- Any change in vision: blurring, a shadow, double vision, loss of part of the visual field, or eye pain
What to do: contact the clinic that treated you immediately, by phone or WhatsApp, and say that you have had filler and what you are seeing; a photograph helps. For any change in vision, go to the nearest emergency department straight away (in Singapore, call 995 if you cannot get there safely). Do not wait to see whether it settles, and do not try to treat it yourself at home.
IN Eternity Clinic patients: WhatsApp or call +65 8815 3008. If you were treated elsewhere, contact that clinic first, because they know which product was used and where; if you cannot reach them, seek medical care without delay.
What are the warning signs of vascular occlusion after filler?
The key warning signs are skin that blanches white, severe or increasing pain, and a mottled, dusky or blue-grey patch; blisters or scabs can follow days later.
| When | What you may notice | What it suggests | What to do |
|---|---|---|---|
| During injection or within minutes | Sudden blanching (white or pale patch); sharp or burning pain out of proportion to the injection | Product in or pressing on an artery | The doctor stops and treats at once |
| Minutes to hours | Mottled, net-like (livedo) or dusky blue-red discolouration; the patch is slow to turn pink again after pressing | Reduced blood flow to the skin | Contact the treating clinic immediately |
| Hours to 2 days | Pain still increasing; discolouration spreading; skin cooler than surrounding skin | Ongoing ischaemia | Same-hour assessment and treatment |
| Days 2–5 | Small blisters, pustules or dark scabs in the same area | Skin injury from lack of blood supply | Urgent review; wound care plan |
| Any time, especially at once | Blurred or lost vision, a shadow, double vision, eye pain, drooping lid, headache or weakness | Vessel connected to the eye or brain affected | Nearest emergency department immediately |
A bruise is the main thing occlusion is mistaken for. A bruise is usually dark purple from the start, sits at an injection point, is tender rather than increasingly painful, and fades through green and yellow. An occlusion more often starts pale, follows the territory of a vessel rather than a single point, hurts more over the first hours, and spreads. If in doubt, ask; a photograph sent by WhatsApp is enough for the clinic to decide how urgently to see you.
Numbing cream and the local anaesthetic mixed into many fillers can mask pain for the first hour or two, which is one reason colour change is watched as closely as symptoms.
Why is vascular occlusion an emergency?
It is an emergency because skin starved of blood can be damaged within hours to days, and an artery connected to the eye can affect vision within minutes.
In the skin, the typical sequence is blanching, then a mottled, dusky patch, then blisters and finally loss of the surface skin in that area a few days later if flow is not restored [4]. With hyaluronic acid filler, the enzyme hyaluronidase breaks the product down, including inside the vessel, so the sooner it is given the more tissue can be saved. In one published protocol the enzyme is given in relatively high doses and repeated hourly until capillary refill, skin colour and pain recover; the author reported no partial or complete skin loss when it was started within two days of onset [5]. That is one author’s series, not a promise, but it explains why waiting overnight is the wrong choice.
Vision is different. Branches of the arteries around the nose, glabella and forehead connect with the artery that supplies the eye. Of the 48 cases of vision loss reviewed for 2015–2018, only 10 recovered fully and 8 partially [2]; the earlier review found that most cases of vision loss did not recover [3]. This is why any change in vision after filler means going straight to an emergency department, without stopping to call around first.
“A bruise is dark and sore and gets better. An occlusion is pale or dusky, hurts more as time passes, and spreads. If you are not sure which one you have, treat it as the second.”
How common is vascular occlusion from filler?
It is rare. The largest practical estimate comes from 370 US dermatologists who reported 1.7 million syringes: about one occlusion per 6,410 syringes by needle and one per 40,882 by cannula [1].
The same study found that injecting with a cannula was associated with 77.1 per cent lower odds of occlusion than a needle, and that doctors injecting for more than five years had lower odds than less experienced injectors; just over a quarter of participants had seen at least one occlusion in a year [1]. True incidence is probably higher than published figures, because events are under-reported [4].
These figures come from experienced dermatologists in one country, so they are not a forecast for any person. A cannula lowers risk without removing it: occlusions occurred with both techniques.
Which areas carry the highest risk of vascular occlusion?
The glabella (between the brows), nose, forehead, nasolabial folds and lips carry the highest risk, because arteries run close to where filler is placed.
| Area | Why the risk is higher | What the evidence shows |
|---|---|---|
| Nose | Small arteries run in the same layer as filler; connections to the eye | More than half of 48 vision-loss cases in 2015–2018 followed nasal injection [2] |
| Glabella (between the brows) | End arteries with little back-up supply; direct connection to the eye | The commonest site in the earlier review of 98 cases [3] |
| Forehead and temples | Branches of the supratrochlear, supraorbital and temporal arteries | Forehead among the commoner sites before vision loss [3,2] |
| Nasolabial folds and lips | The facial and labial arteries run close to the surface here | Most likely areas to be occluded in the dermatology survey [1]; the upper lip artery ran about 3 mm deep along the lip border in a cadaver study [7] |
| Under the eyes | Dense network of small vessels close to the eye | Treated with small amounts, deep, usually by fine cannula |
Area by area, the planning differs. Nose filler, forehead filler and temple filler are planned around these vessels, and lip fillers in Singapore are placed with the labial arteries in mind. Under the eyes, under-eye filler uses soft hyaluronic acid in small amounts.
What happens if vascular occlusion is suspected?
Injection stops, the area is examined for colour and capillary refill, and for hyaluronic acid filler hyaluronidase is given promptly and repeated until blood flow returns.
- Stop and look. The doctor checks the colour of the skin, how quickly it pinks up after gentle pressure, and the pattern of any discolouration, which shows which vessel is involved.
- Dissolve hyaluronic acid. Hyaluronidase is placed throughout the affected area, not only at the injection point, and repeated while signs persist [5]. Where available, ultrasound can show the filler and the vessels around it [8].
- Supportive care. Warm compresses and massage are among the supportive measures described in the literature, given under medical supervision [4].
- Vision symptoms go to hospital. Eye involvement needs emergency hospital care; the clinic does not try to manage it alone.
- Follow-up. Daily reviews and photographs until the skin has recovered, with wound care if blisters form.
Non-HA products such as calcium hydroxylapatite, polycaprolactone and poly-L-lactic acid cannot be dissolved, which is one reason they are placed deep and conservatively. Treatment of an occlusion with these products relies on supportive measures and specialist care; see collagen stimulator side effects.
What should a clinic have ready for a vascular event?
A clinic offering filler should have hyaluronidase on site, a doctor who can recognise and treat occlusion, a written emergency plan, and a route to hospital care.
The international consensus states that should adverse reactions occur, “the clinician must be prepared and have tools available for effective treatment” [6], and reviews describe an emergency kit kept ready for this purpose [4]. Questions worth asking before any filler:
- Is hyaluronidase kept on the premises, today, and is the doctor who injects you the one who would treat a problem?
- Which product is being used, is it registered with the Health Sciences Authority, and will the name and batch go in your notes?
- Who do you contact out of hours if something changes after you leave?
- If you have had filler before, will it be checked, with ultrasound where useful, before more is added?
At IN Eternity Clinic, injectables are performed by Dr Sin Yong himself. Hyaluronidase is kept on hand for hyaluronic acid filler vascular events, the clinic keeps an emergency protocol for them, and an anaphylaxis kit is on site. Earlier filler can be mapped with ultrasound before anything new is added. How screening, infection control and emergencies are handled is on the safety and sterilisation page, and HSA registration is explained separately.
What Dr Sin Yong looks for
- The course of the main facial arteries in the area to be treated, which decides the depth, the entry points and whether a cannula suits.
- Skin colour and capillary refill throughout injection, which is slow, small-volume and stopped at the first sign of blanching or unusual pain.
- Earlier filler in the same area, mapped with ultrasound where useful, because extra volume near a vessel raises the chance of compression.
- Scars or earlier surgery in the area, which can fix vessels in place and change how product spreads.
- Whether the request is realistic for the area, since some concerns are safer treated with something other than filler.
General clinical observations used at consultation; they describe what is checked, not any individual result.
How can you lower your risk of vascular occlusion?
You lower your risk by choosing a doctor-led clinic with hyaluronidase on site, giving a full history, and reporting pain or colour change at once rather than waiting.
- Ask who injects. Filler is a medical procedure; ask whether a doctor will inject and will be available afterwards.
- Give your full history. Earlier fillers (even years ago), threads, surgery, blood-thinning medicines and supplements all matter. Do not stop a prescribed medicine without advice.
- Speak up during treatment. Sharp, burning or unusual pain during injection should be said out loud straight away.
- Watch the first 48 hours. Check the treated area in a mirror in good light that evening and the next morning; send a photograph if anything looks pale, mottled or dusky.
Most filler treatments are uneventful, and most adverse reactions are mild and transient [9]. Knowing these signs is about acting quickly in the rare case that it is needed. If you have ongoing changes after an earlier occlusion, or uneven filler afterwards, filler correction explains how ultrasound-guided dissolving is planned. For how fillers are chosen and planned overall, see dermal fillers in Singapore.
Frequently asked questions
How soon after filler can vascular occlusion happen?
Most cases show during injection or within minutes to hours, as blanching and pain followed by mottled or dusky skin. Occasionally signs appear later, as swelling increases around a vessel. Any pale, dusky or increasingly painful area in the first days after filler should be reported to the treating clinic immediately.
How do I tell a bruise from vascular occlusion?
A bruise is usually dark purple from the start, sits at an injection point, is tender rather than increasingly painful and fades over days. Occlusion often starts pale or white, follows the shape of a vessel, becomes mottled or dusky, and hurts more over time. If unsure, send a photograph to the clinic straight away.
Can vascular occlusion be reversed?
Often, if it is recognised and treated quickly. With hyaluronic acid filler, hyaluronidase dissolves the product and is repeated until blood flow returns. In a large dermatology survey, 85 in 100 occlusions left no long-term effect. Vision loss is different and recovers far less often, which is why it needs emergency hospital care.
Does vascular occlusion hurt?
Usually, yes. Pain that is severe, burning or increasing after filler is a key warning sign. However, numbing cream and the local anaesthetic in many fillers can mask pain for a while, so blanching or a mottled, dusky patch should be acted on even if it does not hurt much.
Can vascular occlusion happen with lip filler?
Yes. The labial arteries run close to where lip filler is placed; in a cadaver study the upper lip artery ran about 3 mm deep along the lip border at the midline. Lips and nasolabial folds were among the areas most often occluded in a large survey. See the lip filler side effects guide.
Is vision loss from filler common?
No, it is very rare. A review identified 48 new published cases worldwide between 2015 and 2018. Most followed injections of the nose, glabella or forehead. Because outcomes are poor when it does happen, any change in vision after filler means going to the nearest emergency department immediately.
What should I do if I see a dusky patch the day after filler?
Contact the clinic that treated you immediately, by phone or WhatsApp, and send a photograph. Do not wait overnight to see whether it settles, and do not try to treat it yourself. If you also notice any change in vision, go straight to the nearest emergency department.
Are some fillers safer for blood vessels than others?
Hyaluronic acid can be dissolved with hyaluronidase if a vessel is blocked; calcium hydroxylapatite, polycaprolactone and poly-L-lactic acid cannot. That makes hyaluronic acid the more correctable choice in higher-risk areas, but any filler can block a vessel. Technique, depth, amount and anatomy matter more than the brand.
Book an assessment
IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, Singapore 228210. By appointment with Medical Director Dr Sin Yong. Monday to Saturday, 11am to 8pm. WhatsApp or call +65 8815 3008. At IN Eternity Clinic a consultation fee applies, and it is waived if you go ahead with any medical treatment; the fee is S$120.
International KOL — CLASSYS · HIRONIC · DEKA · ALMA · FOTONA · LUTRONIC
References
- Alam M, Kakar R, Dover JS, et al. Rates of vascular occlusion associated with using needles vs cannulas for filler injection. JAMA Dermatol 2021;157(2):174-180 (online 2020). doi:10.1001/jamadermatol.2020.5102
- Beleznay K, Carruthers JDA, Humphrey S, Carruthers A, Jones D. Update on avoiding and treating blindness from fillers: a recent review of the world literature. Aesthet Surg J 2019;39(6):662-674. doi:10.1093/asj/sjz053
- Beleznay K, Carruthers JDA, Humphrey S, Jones D. Avoiding and treating blindness from fillers: a review of the world literature. Dermatol Surg 2015;41(10):1097-1117. doi:10.1097/DSS.0000000000000486
- DeLorenzi C. Complications of injectable fillers, part 2: vascular complications. Aesthet Surg J 2014;34(4):584-600. doi:10.1177/1090820X14525035
- DeLorenzi C. New high dose pulsed hyaluronidase protocol for hyaluronic acid filler vascular adverse events. Aesthet Surg J 2017;37(7):814-825. doi:10.1093/asj/sjw251
- Signorini M, Liew S, Sundaram H, et al. Global Aesthetics Consensus: avoidance and management of complications from hyaluronic acid fillers — evidence- and opinion-based review and consensus recommendations. Plast Reconstr Surg 2016;137(6):961e-971e. doi:10.1097/PRS.0000000000002184
- Lee SH, Gil YC, Choi YJ, Tansatit T, Kim HJ, Hu KS. Topographic anatomy of the superior labial artery for dermal filler injection. Plast Reconstr Surg 2015;135(2):445-450. doi:10.1097/PRS.0000000000000858
- Schelke LW, Decates TS, Velthuis PJ. Ultrasound to improve the safety of hyaluronic acid filler treatments. J Cosmet Dermatol 2018;17(6):1019-1024. doi:10.1111/jocd.12726
- Funt D, Pavicic T. Dermal fillers in aesthetics: an overview of adverse events and treatment approaches. Clin Cosmet Investig Dermatol 2013;6:295-316. doi:10.2147/CCID.S50546
These sources describe mechanisms and general evidence. They are not a promise of any individual result; suitability is decided at an in-person assessment.