Lip filler

Lip filler is a hyaluronic acid gel injected into the body of the lips, along the border or into the fine lines above them. The FDA has approved dermal fillers for lip augmentation in adults^[1]. Hyaluronic acid is the standard because it can be dissolved with an enzyme, hyaluronidase, if you dislike the result or something goes wrong.

Many clinics sell lip filler in half and one millilitre syringes. A first treatment is usually best kept small: lips are easier to build up over two visits than to dissolve and start again.

It is worth knowing what else is on offer, because the right answer is not always filler:

It suits lips that have thinned or lost definition over time, a top and bottom lip that look out of balance, and people who want a gradual, reversible change.

It is not for you, or needs a doctor's view first, if:

• You are pregnant or breastfeeding.
• You have a cold sore, an infection or inflamed skin around the mouth. Wait until it has fully healed.
• You have had an allergic reaction to a filler or to lidocaine, the numbing agent many fillers contain.
• You are under 18. Cosmetic lip filler for under 18s is illegal in England^[7], and a clinic that offers it to a minor is breaking the law.
• You want a dramatic change in size. A careful practitioner will talk you out of it.

Swelling, bruising, tenderness and redness are common and usually settle within days^[1]. The lips are one of the most mobile and best supplied parts of the face, so they swell more than most areas.

A 2023 review of published lip filler complications found these reported most often^[5]:

• Lumps and nodules. More than half of the complications in the review. Most can be massaged, dissolved or treated; delayed nodules appearing weeks later are reported in roughly 0.1 to 1 percent of treatments^[6].
• Migration. Filler moving out of the lip, often above the border, which can leave a puffy ridge sometimes called a filler moustache.
• Cold sore outbreaks. Injections can trigger a flare in people who get cold sores. If you do, tell your practitioner; some will suggest an antiviral beforehand.
• Tissue death. Rare, from filler blocking an artery.

The arteries that supply the lips run through them, so a blocked blood vessel is the serious risk. Act at once if you have severe pain, skin that turns white, grey or purple, or blistering on or around the lip during or after treatment. Tell the injector immediately or go to A&E or the emergency room.

Unlike Botox, fillers often need no prescription^[3], so a lip filler appointment may involve no doctor, nurse or pharmacist at all. England announced a licensing scheme for non surgical cosmetic procedures in 2025, run by local councils, with no start date yet^[8]. Until it applies:

• Check the GMC register for doctors, or the voluntary JCCP and Save Face registers the NHS recommends^[3].
• Ask whether the clinic keeps hyaluronidase on site, and who can prescribe it in an emergency. It is a prescription medicine in the UK.
• Avoid lip filler at parties, in homes, or from anyone selling it online.

The FDA's advice applies everywhere: never buy filler online, and never use a needle free "hyaluron pen", which is not approved for fillers and has caused serious injuries^[1].

The NHS puts dermal fillers at £200 to several hundred pounds a treatment, depending on the product, the amount used and the area^[2]. In the US, plastic surgeons reported an average fee of $715 for hyaluronic acid filler in 2023^[4].

Lip filler is usually priced per syringe, and clinics that sell a half millilitre often charge only a little less than for a full one. Ask for the product, the amount and the total in writing, and whether a top up at the review is included.

A price far below the local going rate is a reason to ask what product is being used and who is injecting it.

• Consultation. Your medical history, cold sores included, and a plan for shape and amount. You should hear the risks before anything is injected.
• Numbing. A numbing cream, and most lip fillers contain lidocaine.
• Injection. Small amounts by needle or blunt cannula, checking symmetry as they go.
• Afterwards. Expect swelling for a few days, often worse the next morning. Avoid pressing or massaging unless told to, and follow the clinic's aftercare.
• Review. A check at around two weeks, once the swelling has gone, before any top up.

• Who will inject me, and what is their medical qualification?
• Which product will you use, how much, and can I see the box?
• Do you keep hyaluronidase on site, and what is your plan if a blood vessel is blocked?
• I get cold sores. What do you recommend before treatment?
• Is a review and any top up included in the price?