What are the first signs of a blocked blood vessel after filler?
A blocked blood vessel often starts during treatment or in the first hours with sudden paleness or blanching of the skin, followed by a net-like or blotchy purplish colour change, coolness and increasing, disproportionate pain. Over the following days, blisters or dark crusting may appear in the same area.
A blocked blood vessel (vascular occlusion) happens when filler enters a vessel or compresses it from outside, so the skin that vessel supplies does not receive enough blood. It is a rare complication, but time matters in preventing tissue damage. Symptoms usually start during or just after injection and are sometimes noticed a few hours later. Areas such as the nose, between the brows, the forehead, the nasolabial region and the temples need extra care because of their vessel anatomy. With fillers containing lidocaine, pain may be felt less in the first hours, so watching for colour change in the skin is particularly important.
Blanching and a net-like colour change may follow the course of a vessel and spread across a defined area. When the area is pressed lightly and released, the colour may be slow to return. A blockage not noticed on the first day may show itself on the second or third day as small pimple-like bumps, fluid-filled blisters or darkening colour in the same area. With hyaluronic acid fillers, the doctor usually tries to dissolve the product with hyaluronidase and closely monitors blood flow to the area. That is why, if you suspect a blockage, you should contact the doctor who treated you immediately rather than waiting for hours.
Why is a change in vision the most urgent sign?
Rarely, filler can reach vessels leading to the eye and disrupt blood flow to the retina, which can cause loss of vision that may become irreversible within a short time. If you notice blurred vision, loss of vision, double vision or eye pain, call emergency services (112 in Türkiye) or go to the nearest emergency department without delay.
Some facial vessels connect with the network of vessels around the eye. Filler that reaches one of these can travel backwards under pressure and block the vessels supplying the eye. This complication is extremely rare, but a large share of reported cases have involved areas such as the nose, between the brows, the forehead and the nasolabial region. Symptoms usually begin during or just after injection: sudden blurred or lost vision, severe pain in or around the eye, headache, a drooping eyelid or restricted eye movement. A colour change in the skin on the same side may accompany them.
A vision symptom is not something to wait and see whether it passes. Knowing these symptoms before treatment is the first step in avoiding lost time. If you notice them during treatment, tell your doctor at once; if you notice them afterwards, call 112 or go to the nearest emergency department, ideally at a hospital with an eye (ophthalmology) unit. If you are already back home abroad, use your local emergency number. Letting the doctor who treated you know at the same time means the product name and treated area can be passed on. With vision complications, the outcome depends largely on how quickly treatment is given, and even with rapid treatment vision cannot always be recovered.
How do you recognise an allergic reaction or anaphylaxis?
Mild itching and redness at the treatment site are usually a local reaction. Rapidly developing swelling of the lips, eyelids, tongue or throat, widespread hives, shortness of breath, wheezing, dizziness or a feeling of fainting may be anaphylaxis, and emergency services (112 in Türkiye) should be called immediately.
Serious allergic reactions to aesthetic injections are rare, but a reaction can develop to the product's ingredients, the lidocaine in fillers, numbing creams or the antiseptics used. The severe reaction called anaphylaxis usually starts within minutes to an hour and affects more than one body system: widespread flushing and hives, swelling of the face and throat, a hoarse voice, difficulty breathing, palpitations, nausea and dizziness from a fall in blood pressure may occur. As this can progress within minutes, call 112 without waiting if symptoms start after you have left the clinic. Even mild hives that spread quickly or begin to affect breathing should be treated as an emergency.
If you have ever had an allergic reaction to a medicine, local anaesthetic, filler or product ingredient, always mention it before treatment. With polynucleotide products known as salmon DNA, a history of fish allergy is asked about specifically. Some reactions appear later, days or weeks afterwards, as an itchy, red, firm swelling at the treatment site. These delayed reactions usually do not need the emergency department, but should be reported to the doctor who treated you on the same day. Check with your doctor before starting an antihistamine or steroid on your own.
Which symptoms after Botox are urgent?
After Botox, difficulty swallowing, speaking or breathing, widespread muscle weakness and double vision may indicate that the toxin's effect has spread beyond the treated area. This is very rare at cosmetic doses and can begin anywhere from hours to weeks after treatment; with breathing or swallowing difficulty, call emergency services (112 in Türkiye) without waiting.
A mild headache, small bruises or tenderness at injection points are common after Botox and usually settle by themselves. Unwanted effects can also occur in muscles near the treated area, such as a drooping brow, an uneven smile or weakness of the lip. Although these can be distressing, they are usually not life-threatening and fade over weeks as the toxin wears off; they should still be reported to the doctor who treated you. After masseter treatment the jaw may tire when chewing, and after neck treatment the neck may feel slightly weak. Marked difficulty swallowing, however, should be kept apart from these expected effects and reported without delay.
In what is called distant spread, the toxin's effect extends beyond the treatment area. Symptoms may start from hours to a few weeks after treatment: difficulty swallowing, a change in voice, trouble getting words out, shortness of breath, blurred or double vision and widespread weakness in the arms or neck. This is extremely rare at cosmetic doses and has been associated with high doses, neuromuscular conditions or products of uncertain origin. That is why mentioning any known neuromuscular condition before treatment, and asking about the authenticity of the product, matters. With breathing or swallowing difficulty, call 112 without waiting and pass the product name and dose, if you know them, to the medical team.
When do signs of infection appear?
Infection usually shows itself a few days after treatment as increasing redness, warmth, pain and swelling, sometimes with pus-like discharge or fever. Painful, red lumps appearing in a filler area weeks or months later should also be assessed for infection. With these symptoms, see your doctor the same day.
Normal swelling and tenderness are most noticeable in the first day or two and then ease. With infection the pattern reverses: the redness spreads, the area becomes warm, pain increases as the days pass and tenderness to touch becomes more marked. Some people also feel chills, fatigue and fever. After treatments on or around the lips, the cold sore virus can reactivate; this starts with tingling and forms clusters of small fluid-filled blisters, and should also be reported to your doctor. As cold sore blisters and blisters from a blocked blood vessel are not always easy to tell apart, an assessment with a photo is helpful.
Picking at injection points, squeezing them like spots or applying make-up with an unclean brush or sponge in the first days can increase the risk of infection. Starting antibiotics or steroid creams yourself once symptoms appear can mask the picture and delay a proper assessment. Late firmness and redness in a filler area may relate to a bacterial layer forming on the product surface (biofilm) or to a delayed inflammatory reaction, and the treatment differs. Burns, fluid-filled blisters or open wounds after device treatments are also open to infection and should be assessed the same day.
What should you do if you notice an urgent symptom?
If you have a change in vision, difficulty breathing or swallowing, or swelling of the tongue or throat, call emergency services (112 in Türkiye) at once. With blanching, a net-like colour change or severe pain, contact the doctor who treated you without delay. In every case, share the product name, batch number, treatment time and area with the medical team.
The first step is to decide which group the symptom falls into. If breathing, swallowing, speaking or seeing becomes difficult, call 112 rather than waiting to reach the doctor who treated you. With symptoms suggesting a blocked blood vessel, such as a change in skin colour and severe pain, the quickest route is the treating doctor, who can give treatments such as hyaluronidase; if you cannot reach them, go to the nearest emergency department. Signs of infection such as increasing redness, warmth or fever also call for same-day assessment. Mild swelling or bruising that is steadily easing, on the other hand, may be part of normal healing.
Some steps speed up the assessment. Noting the time the symptom started, taking a photo of the area in good light and keeping the patient card or product label you were given to hand help the medical team decide quickly what can be done for which product. Avoid doing anything to the area yourself or starting over-the-counter medicines without your doctor's advice. If you have a vision problem or feel dizzy, do not drive yourself, and ask someone close to you for help if possible. Finding out before treatment whom to contact, and how, in an emergency prevents lost time. Even if a symptom seems mild, asking when in doubt is safer than waiting.
Frequently asked questions
When is pain after filler normal, and when is it a concern?
A mild ache, tenderness to touch and a feeling of tightness are normal after filler and usually ease day by day. Pain that keeps increasing, is out of proportion to the treatment, or comes with paleness, a net-like colour change or coolness of the skin is a concern. In that case, contact the doctor who treated you without waiting.
I have pimple-like bumps a few days after filler. What could they be?
Pimple-like bumps a few days after filler can have several causes: irritation from make-up or skincare, a cold sore flare, a superficial infection or, less commonly, a blocked blood vessel noticed late. If the bumps cluster along the course of a vessel and come with a colour change, that is an important sign. Take a photo and tell your doctor the same day.
What should I do if I get a cold sore after lip filler?
If you get a cold sore after lip filler, tell the doctor who treated you and avoid touching the blisters. Injections can trigger an outbreak in people who carry the cold sore virus, and your doctor may suggest antiviral treatment if appropriate. If you get cold sores often, mentioning it before treatment allows a preventive approach to be planned in some cases.
My eyelid has drooped after Botox. Is this an emergency?
A mild drooping eyelid on its own after Botox is usually not an emergency, but tell the doctor who treated you. It is usually linked to the toxin spreading to a nearby muscle and fades over weeks as the effect wears off; your doctor may suggest certain eye drops. If the droop comes with double vision or difficulty swallowing or breathing, call emergency services immediately.
If I notice a symptom at night or at the weekend, should I wait until morning?
Do not wait until morning with a change in vision, difficulty breathing or swallowing, tongue or throat swelling, or blanching or a net-like colour change of the skin; these can progress within hours. Use the emergency contact route you were given; failing that, go to the nearest emergency department. Ordinary symptoms such as mild, easing swelling or bruising can wait until morning.
Can an emergency department treat a filler complication?
An emergency department provides first treatment for life-threatening problems such as anaphylaxis, airway problems and loss of vision, and refers on to units such as ophthalmology when needed. Hyaluronidase, used for a blocked blood vessel, may not be available in every emergency department. So when you go, also let the doctor who treated you know, and share the product name, treatment time and area.
What should I do if I get a burn or blisters after a device treatment?
If a burn, blisters or increasing pain develop after a device treatment, keep the area clean and cool, do not burst the blisters and see the doctor who treated you the same day. Putting ice directly on the skin or applying home creams can irritate the tissue. Photographing the area and following the care your doctor recommends helps reduce the risk of scarring and pigmentation.
Is feeling dizzy or faint after an injection dangerous?
Dizziness, sweating and feeling faint during or just after an injection are most often a vasovagal reaction to the needle and usually pass within minutes of lying down with the legs raised. If these symptoms come with widespread hives, swelling of the lips or tongue, shortness of breath or wheezing, it may be anaphylaxis, and emergency services (112 in Türkiye) should be called immediately.
Sources (5)
- U.S. FDA: Dermal Fillers (Soft Tissue Fillers)
- Goodman GJ, Magnusson MR, Callan P, et al. (Aesthetic Surgery Journal): A Consensus on Minimizing the Risk of Hyaluronic Acid Embolic Visual Loss and Suggestions for Immediate Bedside Management (2020)
- MHRA: Updated warnings for botulinum toxin products following rare cases of botulism (2026)
- American Society for Dermatologic Surgery: Preventing and Treating Adverse Events of Injectable Fillers: Evidence-Based Recommendations From the American Society for Dermatologic Surgery Multidisciplinary Task Force (2021)
- EMA: Nuceiva (botulinum toxin type A): Annex I, Summary of Product Characteristics (2024)
This content is for general information and does not replace a personal medical assessment.