Hyaluronic acid for neck lines: indications and limits

Horizontal neck lines are a growing concern and, at the same time, one of the areas where hyaluronic acid has the most limits. The skin is thin, the muscle is superficial, there is little fat and the movement is constant. This page gathers what the practitioner needs to weigh when assessing the indication, the risks and the alternatives, at a review level. The decision to treat, the product and the technique belong to the licensed practitioner, according to the product label and the rules of their professional board.

What are neck lines and where do they come from?

The term "neck lines" groups different findings. The most cited are horizontal neck lines, which arise from a combination of factors:

1. Repeated movement, such as neck flexion and phone use, which folds the skin at the same points every time.
2. Loss of elasticity and collagen with age and sun exposure (photoaging).
3. Individual predisposition: some people get the lines early, even when young.
4. Platysma activity and vertical bands, which change the skin's dynamics.
5. Weight changes and volume loss in the area.

For an overview of the area, see neck aging and the area page for the neck.

Why does neck skin limit hyaluronic acid?

Neck skin is among the thinnest of the face and neck, with fewer sebaceous glands and less subcutaneous tissue. That has three direct consequences:

• Visible gel. Any product that is too superficial or in excessive amount can be visible or palpable.
• Tyndall effect. Superficial gel in thin skin can give a bluish tint. See Tyndall effect.
• Mobility. The area folds and stretches all the time, and the gel has to keep up without forming a cord or nodule.

There is also little room for correction: irregularities are harder to disguise. That is why practitioners tend to be more conservative, with more flexible products and smaller amounts, at their discretion.

When can hyaluronic acid come in?

It is generally considered in selected cases:

• static horizontal lines that are relatively marked;
• skin with enough thickness and good quality;
• a patient with realistic expectations who accepts partial improvement;
• no contraindications and no history of reactions to fillers.

It is not usually the first choice in necks with a lot of laxity, prominent platysmal bands, very thin skin or signs of intense photodamage. In those cases, the assessment may point to other approaches or combinations.

Alternatives and combinations

Hyaluronic acid is rarely the only path. Many practitioners combine approaches or choose a better one:

Skin booster

The skin booster aims at hydration and better skin quality, with superficial injection. See skin booster for the neck. The goal is not to fill a crease, but to improve texture over a series of sessions, with results that vary.

Collagen biostimulator

The collagen biostimulator seeks to stimulate the tissue gradually. The neck and décolleté have their own particulars, described in biostimulator for the neck and biostimulator for the décolleté.

Toxin in the platysmal bands

When there are bands and activity of the platysma, a muscle approach may have a role. See botulinum toxin in the platysmal bands and early signs of platysma. Caution: injections in this area require detailed knowledge of anatomy because of the risk of effects on neighboring structures, such as dysphagia and voice changes (see dysphagia and voice after neck toxin).

Threads and devices

PDO threads and technologies such as radiofrequency and microfocused ultrasound have a place in other patient profiles. See PDO threads for the neck and lower third and microfocused ultrasound.

Risks and what to anticipate

The risks of filler in the neck are those of filler in general, made worse by thin skin:

• Irregularity, cords and nodules, because of the little room for correction. See nodule.
• Tyndall effect, if the product stays superficial.
• Swelling and bruising (swelling, bruise), which tend to be more visible in thin skin.
• Infection and biofilm, as with any injection.
• Vascular compromise, rarer in this area but possible, which makes it necessary to have hyaluronidase on hand.
• Insufficient result, the most frequent in practice: the gel softens but does not eliminate.

How to run the visit

Standardized photography

The neck requires constant light and position to compare progress. Use the guide for standardized clinical photography and note the head position in each photo.

Expectations and follow-up

Agree from the first visit that treating the area may take sessions, combinations and maintenance, and that the result varies from person to person. Schedule a clinical follow-up, as in the clinical follow-up visit.

Expected timeline, in general terms

How Harmy fits in

The neck is not one of the app's marking points. The app detects the face in the frontal photo and works with glabella, temple, tear trough, cheekbone, nasolabial fold, mouth corner, lips, chin and jawline. For this area, Harmy's projection does not apply, and it is better to make that clear to the patient so as not to create an expectation the app does not cover. The app is still useful for planning the facial areas that are part of the same harmonization plan. Remember that the projection is an illustrative simulation, not a promise of results.