Dermal Fillers
- Independent guide from The Hair & Beauty Directory
About Dermal Fillers
Dermal fillers are injectable gels, most commonly made from hyaluronic acid, used to restore volume, smooth lines, define features such as the lips, cheeks or jaw, and rebalance facial contours. Because they are injected into or beneath the skin, fillers are a medical aesthetic procedure rather than a beauty treatment, and the way they are carried out matters enormously for both your safety and your result. In the UK, hyaluronic acid fillers are not currently classed as prescription-only medicines, which means the sector is still developing tighter oversight, so choosing a qualified, insured and appropriately regulated practitioner is the single most important decision you make. A good result looks natural and suits your face; the amount, product and placement can all be tailored to what you want, from very subtle softening to more noticeable definition. Results are not permanent and gradually break down over months. Most hyaluronic acid fillers can be dissolved if needed, which is a genuine safety advantage, but this should be a reassurance rather than a reason to treat the procedure casually. Understanding what fillers can and cannot do, and having a proper face-to-face consultation, helps you make a safe, informed choice.
On the day, and after
During the treatment
Your appointment should begin with a consultation, a review of your medical history and clear consent before anything is injected. The practitioner cleans the skin thoroughly to reduce infection risk and may mark the areas to be treated. Many hyaluronic acid fillers contain a local anaesthetic, and a numbing cream is sometimes applied first, particularly for lips. The filler is injected using a fine needle or a blunt-tipped cannula, and you may feel small scratches, pressure or a stinging sensation. The practitioner will often pause to check symmetry, sometimes asking you to sit up or look in a mirror, and may gently massage or mould the product into place. A single area typically takes around fifteen to thirty minutes. Throughout, a careful practitioner watches for warning signs such as unusual blanching or disproportionate pain, which can indicate a blood vessel problem needing immediate action. You should feel able to ask questions or ask them to stop at any point.
How it feels
As the filler goes in you will usually feel small sharp scratches, a stinging or burning sensation, and a sense of pressure or fullness as the product is placed and moulded. Areas such as the lips are more sensitive and can feel more uncomfortable, which is why numbing cream or filler containing local anaesthetic is often used. Afterwards it is common for the treated area to feel tender, tight, swollen and a little firm or lumpy to the touch for a few days as it settles. Mild throbbing and bruising can occur. What is not normal is severe, escalating or disproportionate pain, or pain that comes on with skin colour changes, as this can signal a blood vessel problem and needs urgent attention.
Results and maintenance
Results are visible straight away but look their best once swelling and any bruising settle over roughly two weeks. How long they last depends on the product, the area treated, how your body breaks the filler down and how much was used; as a general guide many hyaluronic acid fillers last somewhere between six and eighteen months, with lips often at the shorter end because the area is mobile. Fillers fade gradually rather than disappearing overnight, so you can decide in an unhurried way whether to top up. A conservative approach, treating gradually and reviewing results, tends to age more naturally than repeated overfilling. Protecting your skin from sun, staying hydrated and looking after your general health may support your result. If you ever want to reverse hyaluronic acid filler, or correct an uneven result, it can usually be dissolved by a suitably qualified practitioner. Return to the same trusted practitioner for reviews and any maintenance.
Before and after your appointment
Before your appointment
Start by booking a face-to-face consultation with a qualified, insured practitioner, ideally a medical professional, who will take a full medical history and discuss your goals honestly before agreeing any treatment. Share all medicines and supplements, any history of cold sores, allergies, autoimmune conditions, previous fillers or aesthetic work, and whether you are pregnant or breastfeeding, as these can affect suitability. To reduce bruising, many practitioners suggest avoiding alcohol for around 24 hours beforehand and, where it is safe to do so, pausing blood-thinning supplements such as fish oil, vitamin E or high-dose aspirin, but only stop prescribed medication on the advice of the doctor who prescribed it. Arrive with clean skin and no heavy make-up. Avoid booking fillers right before a big event such as a wedding, as bruising and swelling are common and unpredictable. A trustworthy clinic will never pressure you and will give you a clear cooling-off period to think before you commit.
Aftercare
Immediately afterwards you may have redness, swelling, tenderness or small raised areas, which usually settle over a few days. In most cases you can gently apply a cool pack to ease swelling, but avoid firm pressure or massaging the area unless your practitioner tells you to. For roughly the first 24 to 48 hours it is sensible to avoid alcohol, strenuous exercise, saunas, steam rooms, sunbeds and very hot environments, as heat and raised blood flow can worsen swelling and bruising. Try to keep make-up off fresh injection points for the first day to lower infection risk, and avoid facials, chemical peels or other facial treatments for a couple of weeks. Sleep slightly propped up on the first night if your face feels swollen. Keep the number your practitioner gives you for urgent concerns, and follow any product-specific advice they provide. Small lumps can often be smoothed, so mention them at review rather than pressing on them yourself.
Fillers are often described as having little downtime, and many people return to daily activities the same day, but some visible swelling, bruising and tenderness is normal and can last several days. Lips in particular can swell noticeably for the first 24 to 72 hours. Bruising, if it occurs, may take up to a week or two to fade fully and can usually be covered with make-up after the first day. The final result typically settles over about two weeks as any swelling resolves and the product integrates, so avoid judging your outcome too early or booking top-ups before this settling period is complete. If pain or swelling is worsening rather than improving, contact your practitioner promptly.
Safety and medical considerations
Safety essentials
The most important safety step is who treats you: choose a practitioner who is qualified, trained specifically in injectables, fully insured and, ideally, a regulated medical professional such as a doctor, dentist, nurse or pharmacist who can manage complications. Ask what filler is being used, that it is a known branded product, and that hyaluronidase, the enzyme used to dissolve hyaluronic acid filler in an emergency, is available on site along with a clear complications plan. Treatment should happen in a clean, professional clinic with single-use needles, never at a party or in an unhygienic setting. A face-to-face consultation, full medical history and written consent are essential, and you should never feel rushed or pressured by discounts or time-limited offers. The most serious risk is accidental injection into a blood vessel (vascular occlusion), which can cause tissue damage or, very rarely, blindness, and needs immediate expert treatment. A practitioner who can recognise and manage this is your key safeguard.
Medical considerations
Fillers are not suitable for everyone, and a responsible practitioner will decline treatment where risk is too high. Tell your practitioner if you are pregnant or breastfeeding, as fillers are generally avoided at these times, and if you have any active skin infection, cold sore or acne breakout in the area, an autoimmune condition, a bleeding disorder, or a history of significant allergies or previous reactions to fillers. A tendency to keloid or abnormal scarring, and recent or planned dental work, are also relevant, as is a history of cold sores, which may warrant preventive antiviral medication before lip treatment. Blood-thinning medicines increase bruising risk and should only ever be adjusted by the prescribing doctor. If you have had permanent or semi-permanent fillers previously, or aesthetic threads, mention this, as it affects planning. Fillers are a cosmetic procedure, not a treatment for medical or psychological conditions; if you are seeking treatment during a difficult time, a good clinic will encourage you to pause. When in doubt, speak to your GP.
Patch testing
A skin patch test is not routine for hyaluronic acid fillers, because they are designed to be compatible with the body and true allergy is rare, so the meaningful safeguard is a thorough face-to-face consultation and medical history rather than a patch test. This consultation is where a good practitioner screens for the things that genuinely raise your risk: allergies, autoimmune conditions, bleeding tendencies, medicines, pregnancy, skin infections, cold sore history and previous aesthetic work. From a UK liability point of view this matters, because documented assessment, informed consent and clear contraindication checks are what protect both you and an insured practitioner if anything goes wrong. If a non-hyaluronic-acid product is proposed, ask specifically whether allergy testing is advised for that product. Anyone who skips consultation and history-taking and goes straight to injecting is cutting the most important safety corner.
Knowing a good practitioner
Green flags
Good practice starts with an unhurried, face-to-face consultation where the practitioner listens to your goals, takes a full medical history, explains the risks and benefits honestly and is happy to say no if fillers are not right for you. Look for a qualified, insured practitioner, ideally a regulated medical professional, working from a clean, professional clinic with single-use needles and named, branded products. They should give you written information and consent, a cooling-off period rather than pressure, and clear aftercare with a contact number for urgent concerns. Reassuring signs include hyaluronidase kept on site, a written complications protocol, before-and-after photos of their own work, and a natural, conservative approach that favours subtle enhancement and building up gradually over time rather than overfilling in one session.
Red flags
Be wary of anyone who cannot show relevant qualifications, training and insurance, or who works from a home, party, hotel room or other non-clinical setting. Heavy discounting, pressure to decide quickly, buy-one-get-one offers and no proper consultation or medical history are serious warning signs. It is a red flag if the practitioner will not tell you exactly which product they use, cannot confirm hyaluronidase is on site for emergencies, or has no plan for managing complications. Reused or non-sterile needles, no written consent, and unrealistic promises should all make you walk away. After treatment, seek urgent help if you have severe or increasing pain, skin that turns white, dusky, blotchy or grey, a spreading dull ache, vision changes, or signs of infection such as heat, spreading redness and pus.
Questions to ask
- What are your qualifications, training in injectables and insurance, and are you a regulated medical professional who can manage complications?
- Exactly which filler product will you use, is it a known branded product, and why is it right for me?
- Do you keep hyaluronidase on site, and what is your written plan if a complication such as a vascular occlusion happens?
- Based on my medical history and goals, am I a suitable candidate, and is there any reason I should not have this?
- What results can I realistically expect, how long will they last, and can we build up gradually rather than overfilling?
- What aftercare should I follow, what is normal versus a warning sign, and how do I reach you urgently if I am worried?
Frequently asked questions
Are dermal fillers safe?
In most cases hyaluronic acid fillers are well tolerated when carried out by a qualified, insured and ideally medically trained practitioner in a clean clinical setting. Most side effects, such as swelling and bruising, are mild and short-lived. The main serious risk is filler accidentally entering a blood vessel, which is rare but a medical emergency, so who treats you and their ability to manage complications matters more than anything else.
Does it hurt?
You will usually feel small scratches, stinging and pressure. Many fillers contain a local anaesthetic and numbing cream can be applied first, so discomfort is typically manageable. Lips tend to be the most sensitive area. Some tenderness and swelling afterwards is normal, but severe or worsening pain is not and should be reported straight away.
How long do fillers last?
It varies by product, area and individual, but many hyaluronic acid fillers last roughly six to eighteen months before gradually breaking down. Lips often fade faster because the area moves a lot. Your practitioner can give you a more specific idea based on the product used and where it is placed.
Can fillers be dissolved or reversed?
Most hyaluronic acid fillers can be dissolved using an enzyme called hyaluronidase, given by a suitably qualified practitioner. This is used both in emergencies, such as a suspected vascular occlusion, and to correct or reverse an unwanted result. It is a genuine safety benefit of hyaluronic acid fillers, but not a reason to treat the procedure lightly.
Is filler regulated in the UK, and who should inject it?
Hyaluronic acid fillers are not currently prescription-only medicines in the UK, and a dedicated England licensing scheme for non-surgical cosmetic procedures is still being developed rather than fully in force, so you should check the current rules. Because oversight is still catching up, it is best to choose a qualified, insured practitioner, ideally a regulated medical professional, and not to have fillers under 18.
This guide is general information, not medical advice. Speak to a qualified practitioner, and to your GP if you have a medical condition, before booking.