Filler side effects

Q: What are the most common side effects of dermal fillers?

Common side effects include swelling, redness, tenderness, bruising, mild discomfort, itching, small lumps and temporary unevenness. These reactions often improve as the area recovers.

Q: How long do dermal filler side effects last?

Mild reactions commonly improve within several days. Swelling and bruising may remain visible for up to around two weeks, depending on the person and treatment area.

Q: Is swelling after fillers normal?

Mild swelling is common, particularly during the first few days. Contact the clinic if it becomes increasingly painful, continues to worsen or occurs with other unusual symptoms.

Q: Is bruising after fillers normal?

Small bruises can occur after injections and are usually temporary. Large, spreading or increasingly painful discolouration should be assessed.

Q: When should I contact the clinic after fillers?

Contact the clinic if you experience severe or increasing pain, unusual skin discolouration, fever, discharge, worsening swelling, visual symptoms or symptoms that are not improving.

Q: Which filler side effects require urgent assessment?

Visual changes, severe pain, rapidly increasing swelling or pale, grey, dark or mottled skin should be assessed urgently.

Q: What are the risks of dermal fillers?

Risks include swelling, bruising, unevenness, lumps, infection, inflammatory reactions, filler migration and vascular complications. Serious complications are uncommon but require prompt assessment.

Q: What are the disadvantages of dermal fillers?

Results are usually temporary, maintenance may be needed and treatment costs can recur. Side effects or complications are also possible, and results can differ from expectations.

Q: Can dermal fillers cause long-term problems?

Temporary fillers are usually broken down gradually. However, persistent lumps, migration, unevenness or inflammatory reactions can occasionally occur and should be assessed.

15 July 2026

The contents of this article is medically checked by:
Drs. Tom van Eijk

Dermal filler side effects can include swelling, redness, tenderness, bruising, small lumps and temporary unevenness. These reactions are often mild and temporary, but symptoms that become more painful, worsen or involve unusual skin discolouration should be taken seriously.

This page explains which reactions may be part of normal recovery, which warning signs require attention and when to contact your treating clinic or seek medical help.

Seek urgent medical advice if you experience severe or increasing pain, visual changes, rapidly worsening swelling, fever, discharge or pale, grey, dark or mottled skin.

Before treatment, ask the practitioner about possible side effects, the product being used and the clinic’s aftercare arrangements. After treatment, contact the clinic if your symptoms feel unusual or are getting worse.

You can also learn more about what dermal fillers are and how they work.

Common side effects of dermal fillers

Side effects may occur because the skin and surrounding tissue react to the injection and the filler product. The reaction can vary according to the person, treatment area, product, injection technique and aftercare.

Common reactions include:

Swelling
Redness
Tenderness
Bruising
Mild discomfort
Itching
Small lumps or temporary firmness
Temporary unevenness
A tight or pressured feeling
A small injection mark

Swelling after fillers

Swelling is common after treatment and may be visible immediately. It can change during the first few days, particularly in the lips and areas with thin skin.

Contact the clinic if swelling continues to increase, becomes painful or occurs with skin discolouration, fever or other unusual symptoms.

Bruising after fillers

Bruising can happen when a small blood vessel is affected during injection. It is usually temporary, although its appearance varies between people and treatment areas.

Large, spreading or increasingly painful discolouration should be assessed.

Add an internal link to the UK page about bruising after fillers.

Redness and tenderness

Mild redness and tenderness around the injection points can be expected shortly after treatment.

Redness that spreads, feels hot or occurs with fever should be assessed by the clinic or another healthcare professional.

Small lumps or firmness

Small lumps or temporary firmness can sometimes be caused by swelling or the way the product has settled.

Hard, painful, growing or persistent lumps should be checked by the treating practitioner.

Temporary unevenness

Swelling can make the treated area look uneven during early recovery. The final result should not be judged immediately.

Contact the clinic sooner if unevenness occurs with severe pain, marked skin discolouration or another concerning symptom.

What is normal after fillers and when should you call the clinic?

Many reactions after fillers are temporary. Contact the clinic if symptoms are becoming worse rather than improving, or if you are uncertain about what you are experiencing.

Swelling

Mild swelling during the first few days can be normal.

Contact the clinic if swelling is increasing, painful, severe or lasts longer than expected.

Bruising

A small bruise around an injection point can be normal.

Seek advice if the discolouration is spreading, unusually painful or accompanied by pale, grey, dark or mottled skin.

Redness

Short-term redness around an injection point may be expected.

Contact the clinic if redness spreads, becomes hot or occurs with fever or discharge.

Lumps

Small areas of temporary firmness can occur while swelling settles.

Hard, painful, growing or persistent lumps should be assessed.

Pain

Mild tenderness can occur after treatment.

Severe, increasing or unexpected pain requires prompt assessment.

Unevenness

Temporary unevenness may be caused by swelling.

Arrange a review if it remains after the recovery period or is particularly noticeable.

Skin discolouration

A typical bruise may be temporary.

Pale, grey, dark or mottled skin, particularly when combined with pain, should be assessed urgently.

Do not try to treat unusual symptoms yourself unless you have been advised to do so by an appropriately qualified healthcare professional.

How long do dermal filler side effects last?

Mild dermal filler side effects commonly improve within several days. Swelling and bruising may remain visible for longer, sometimes up to around two weeks.

Recovery varies according to the person, product, injection technique and treatment area.

During the first few hours

You may notice redness, tenderness, mild swelling or small injection marks.

During the first one to three days

Swelling and bruising may become more noticeable before they begin to settle.

During the first week

Most mild reactions should gradually improve.

After one to two weeks

The result is often easier to assess once swelling and bruising have reduced.

When symptoms last longer than expected

Contact the clinic if symptoms are worsening, painful, unusual or not showing signs of improvement.

Avoid judging the result too quickly. Early swelling can make the treated area look fuller, firmer or less even than the eventual result.

Read more about how long do fillers last.

Side effects in different treatment areas

The type and visibility of side effects can vary according to the area being treated.

Lips

Possible reactions include swelling, bruising and tenderness. Lip swelling can become noticeable quickly because the area is mobile and has a rich blood supply.

Tear trough and under-eye area

Swelling, bruising, a blue-grey appearance or visible unevenness can occur. Thin skin makes product selection and placement particularly important.

Cheeks

Tenderness, swelling and temporary unevenness may occur. The appearance can change as the swelling settles.

Jawline

Tenderness, bruising or a feeling of pressure can occur. Firmer products and deeper injection techniques may be used in this area.

Chin

Swelling, tenderness and temporary unevenness are possible. Movement of the surrounding muscles can affect how the area looks during recovery.

Nasolabial folds

Redness, swelling and bruising can occur. Treatment may soften the fold, but natural facial lines will usually remain.

Temples

Tenderness and swelling are possible. Detailed anatomical knowledge is especially important because of the structures in this area.

Hands

Bruising and swelling can be more visible because the skin is thin and blood vessels may be prominent.

For areas such as the under-eyes, nose, temples and lips, compare clinics by practitioner experience, consultation quality, aftercare and patient reviews rather than cost alone.

Side effect, complication or risk: what is the difference?

Not every symptom after fillers is a complication.

Side effect

A side effect is usually a temporary reaction to the injection or product.

Examples include mild swelling, redness, tenderness and bruising.

Complication

A complication is a problem that may require assessment or treatment.

Examples can include infection, a vascular problem or a persistent inflammatory lump.

Risk

A risk is a possible unwanted outcome associated with treatment.

Examples include unevenness, filler migration, infection or an unsatisfactory result.

Disadvantage

A disadvantage is a practical or cosmetic limitation rather than a medical complication.

Examples include repeat treatment costs, maintenance and temporary results.

Risks and disadvantages of fillers

Risks can range from temporary swelling and bruising to less common problems such as infection, inflammatory reactions, filler migration, persistent lumps or vascular complications.

The likelihood and type of risk can be influenced by the filler product, injection technique, treatment area, anatomy and practitioner experience.

Dermal fillers are usually temporary, may require maintenance and may not produce the exact result a person expected. A detailed consultation is therefore important before choosing a product, treatment area or amount of filler.

What do dermal fillers do in the body?

Many temporary dermal fillers contain hyaluronic acid. Hyaluronic acid attracts water and can provide temporary volume or support within the treated area.

The body gradually breaks down temporary fillers, although the speed of this process varies between people and products.

Biostimulatory and permanent fillers work differently. Their possible side effects and the available treatment options for complications may also differ.

Can dermal fillers be dissolved?

Some fillers can be dissolved when there is a complication or an unwanted result. This mainly applies to hyaluronic acid fillers.

A healthcare professional may use hyaluronidase, an enzyme that breaks down hyaluronic acid. However, dissolving treatment should only be considered after the problem and filler type have been assessed.

Permanent fillers, some biostimulatory products and other filler types cannot necessarily be dissolved in the same way.

Dissolving a filler is not always required or appropriate. Depending on the symptoms, monitoring, a clinical review or another form of treatment may be recommended.

Do not try to diagnose or manage the problem yourself.

How can you reduce the risk of filler side effects?

1 Choose an experienced practitioner with detailed knowledge of facial anatomy.
2 Ask which filler product will be used and why it suits the treatment area.
3 Discuss your medical history, medication, allergies and previous cosmetic treatments.
4 Ask which reactions are expected and when you should contact the clinic.
5 Check whether clear aftercare instructions and follow-up support are provided.
6 Ask how the clinic assesses and manages suspected complications.
7 Compare practitioner experience, reviews and costs rather than choosing by price alone.
8 Avoid rushed consultations, unclear offers or pressure to proceed immediately.
9 Follow the aftercare instructions provided by the practitioner.
10 Contact the clinic if you are unsure instead of trying to treat symptoms yourself.

Questions to ask before choosing a clinic

Which filler will be used?

Ask for the product name, filler type and an explanation of why it is suitable for the treatment area.

Which side effects are expected?

The practitioner should explain which reactions are common, how long recovery may take and which symptoms require attention.

Is aftercare included?

Ask how to contact the clinic if you develop swelling, pain, lumps, skin discolouration or another concern after treatment.

What happens if there is a complication?

Ask whether the clinic has a clear complications protocol and who will assess you if an urgent problem occurs.

Can the filler be dissolved?

Hyaluronic acid fillers may sometimes be dissolved using hyaluronidase. The decision should be made following an appropriate clinical assessment.

How to compare dermal filler clinics

Compare clinics by more than the advertised treatment cost.

Consider:

The practitioner’s training and experience
Experience with your chosen treatment area
The quality of the consultation
The filler product being used
Clear explanations of risks and expected recovery
Availability of aftercare
How the clinic manages complications
Independent patient reviews
The total treatment and follow-up cost

A suitable consultation should explain what can realistically be achieved, which side effects are possible, which product is recommended and when you should contact the clinic after treatment.

Cosmetic treatment should never feel rushed or compulsory.