A Complete Patient Guide to Lip Filler

Lip filler is the injectable treatment most often associated with outcomes people wish they had not had. Overfilled lips, visible filler through thin skin, duck-like protrusion, asymmetry: these are the images that come to mind for many patients considering treatment, and they come to mind because they happen, consistently, at clinics where the approach to volume, technique and product selection is wrong. They are entirely avoidable. This guide explains what lip filler actually involves, what makes lips anatomically different from every other filler site, how product and technique choices determine the quality of the outcome, and what to expect at each stage.

Why lips are different

Lips are arguably the most technically demanding filler site on the face. Three characteristics set them apart.

Movement. Lips are in constant motion. Filler placed in the lips must be soft enough to move naturally with the tissue, rather than creating a firm, rigid mass that resists animation.

Vascularity. The lip region has a dense blood supply. The labial arteries run close to the surface, within the lip tissue itself at the vermilion border. This makes the vascular complication risk for lip filler among the highest of any facial site. Our guide to vascular occlusion and filler safety covers this in detail.

Metabolism. Lips metabolise hyaluronic acid faster than most other areas. Results typically last four to eight months.

Lip anatomy and what can be addressed

The vermilion border is the defined edge separating the coloured lip tissue from the surrounding skin. Filler placed precisely along this border restores definition without necessarily adding significant volume.

The body of the lip can be augmented with volume or left as definition-only work, depending on the patient’s anatomy and goals.

The Cupid’s bow is the double-curved peak of the upper lip. It can be enhanced or subtly reshaped with careful filler placement.

The philtrum columns, the ridges running from the base of the nose to the Cupid’s bow, project and define the upper lip’s central structure.

The commissures, the corners of the mouth, can turn downward with age and fat pad descent.

How lips change with age

Volume loss in the lips is one component of lip ageing, but not the most significant for most patients. The changes that tend to bother people most are loss of vermilion definition, thinning of the lip body, downturning of the corners, and the development of vertical lip lines. These changes are not all addressed by lip filler alone. Understanding which aspect of the lip is the actual concern is the first step in the consultation.

Product selection

Not all HA fillers are appropriate for lips. The requirement is a low-viscosity, cohesive product that integrates naturally with the tissue, moves with animation, and does not create nodules or visible firmness. Higher-viscosity products designed for cheeks or jawline work are inappropriate in the lips.

Volume: less than you think

The most common mistake in lip filler is too much volume. Most first-time patients are well served by 0.5ml to 1ml of a carefully placed, low-viscosity product. Building volume incrementally across multiple appointments consistently produces better outcomes than large single-session volume.

What happens during treatment

Topical anaesthetic is applied for twenty to thirty minutes before treatment. Most lip filler products also contain lidocaine in the formulation. Despite this, the lip is sensitive and most patients describe the experience as more uncomfortable than other filler sites. It is brief and well-tolerated.

Filler is placed using a fine needle at multiple injection points along the vermilion border and within the body of the lip, depending on the treatment plan. Cannula technique is used in some approaches for the body of the lip.

The settling period

Swelling after lip filler is the rule, not the exception. The lips swell significantly in the first 24 to 48 hours. The immediate post-treatment appearance is not the final result.

Bruising is common and can be significant given the vascularity of the area. Avoid heat, alcohol, strenuous exercise and pressure on the lips for 24 hours after treatment. Cold sore history must be declared before treatment: injectable trauma can reactivate dormant herpes simplex virus and antiviral prophylaxis is given in advance where there is a relevant history.

Pricing and eligibility

Lip filler at The London Road Clinic is from £240 per session. All prices include VAT. Under UK age-restriction legislation introduced in October 2021, cosmetic lip filler cannot be offered to anyone under 18.

Frequently asked questions