The Ageing Neck, Layer by Layer: What the Evidence Shows

The Ageing Neck, Layer by Layer: What the Evidence Shows

The neck is one of the areas people most often notice changing over time, yet it tends to receive far less attention than the face in everyday skin care.

Part of the reason the neck can show change is its anatomy. It is made up of distinct layers, including skin, fat and a thin sheet of muscle, and each of these layers changes in its own way. Understanding what the evidence says about each layer, and what it does not say, supports more informed decisions about skin health.

Why Is Neck Skin Different?

Neck skin is considerably thinner than facial skin. A clinical review published through StatPearls notes that the combined thickness of the epidermis and dermis on the neck averages just over 0.25 mm, while the skin of the cheek measures more than 1 mm.

The same review notes that neck skin has fewer dermal appendages, the structures within the skin such as oil glands and hair follicles. Neck skin also often shows signs of sun exposure similar to those seen on the face. Together, these features help explain why changes in the neck can become noticeable, and why the area is approached with particular care in clinical settings.

Layer One: The Skin

The outermost layer of the neck is the skin itself, made up of the epidermis and the dermis beneath it. The dermis contains collagen and elastin, structural proteins that contribute to skin firmness and elasticity.

Over time, changes within the dermis are well documented. A review published in Cosmoderma describes reduced cell numbers in the dermis, a flattening of the junction between the epidermis and dermis, and fragmentation of dermal collagen with age.

These changes reflect two broad influences. Intrinsic ageing relates to time and genetics. Extrinsic ageing relates to external factors, the most significant of which is ultraviolet (UV) radiation, a process known as photoageing. A 2024 narrative review in Dermatological Reviews describes how photoageing on the neck can show as rough or crepey texture, uneven pigmentation, small visible blood vessels and reduced firmness.

Layer Two: Subcutaneous Fat

Beneath the skin sits a layer of subcutaneous fat, which lies between the dermis and the platysma muscle. This fat contributes to the contour of the neck and the angle between the jaw and the neck.

The 2024 review in Dermatological Reviews notes that the volume of this fat layer can increase with age and with body weight. Fat can also accumulate under the chin, in an area known as the submental region. In other individuals, reduced fat in the neck can make underlying structures more visible. How this layer changes varies considerably from person to person.

Layer Three: The Platysma Muscle

Beneath the fat lies the platysma, a thin, broad sheet of muscle that runs from the lower face down over the front of the neck. It is continuous with the supportive muscular and fibrous layer of the face, known as the superficial musculoaponeurotic system (SMAS).

With age, the platysma can lose tone and be drawn outwards, causing its inner edges to separate. The StatPearls review explains that this separation can produce the vertical bands sometimes visible at the front of the neck, known as platysmal bands. These bands may be more noticeable during speaking or other movement, which is why clinicians typically assess the neck both at rest and in motion.

The Role of Sun Protection

Of the factors that influence skin over time, UV exposure is one of the few that can be modified day to day. Some of the strongest evidence on this comes from Australia.

The Nambour Skin Cancer Prevention Trial, conducted in Queensland and published in Annals of Internal Medicine in 2013, randomly assigned 903 adults under 55 to either daily or discretionary sunscreen use. After 4.5 years, the daily sunscreen group showed no detectable increase in skin ageing, and overall skin ageing was 24% lower than in the discretionary group. It is worth noting that skin changes in this trial were measured on the backs of the hands, so the findings relate to sun-exposed skin generally rather than the neck specifically.

Cancer Council Australia recommends using a sunscreen that is SPF50 or SPF50+, broad-spectrum and water-resistant whenever the UV Index is 3 or above, reapplied every two hours, and used alongside protective clothing, a broad-brimmed hat, shade and sunglasses. The neck is an area that is easily missed when applying sunscreen, so extending application below the jawline and around the sides and back of the neck is a simple, practical habit.

Sun protection supports overall skin health, though it cannot prevent all changes associated with time, genetics and the deeper layers of the neck.

Individual Variation

Not everyone experiences the same changes in the neck, or at the same time. The degree to which each layer changes depends on a number of individual factors, including age, genetics, cumulative sun exposure, skin type, body weight and weight changes, the underlying structure of the jaw and neck, and overall health.

Because the skin, fat and muscle layers each change in different ways, two people of the same age may notice quite different things. This is why clinical reviews describe assessing each layer separately rather than viewing the neck as a single area.

A Note on Consultation

In-clinic options for the neck vary depending on which layers are involved, and each carries its own considerations, risks and recovery. Not all options are appropriate for everyone, and some people may decide that no treatment is the right choice for them.

If you would like to explore which treatment options may be suitable for you, our clinic offers consultations to discuss your individual needs. Any assessment at Dr Wod Cosmetic Clinic begins with understanding your health background, current circumstances and what is relevant to you specifically.

This information is general in nature and does not replace a personalised medical assessment. Individual needs, circumstances, and responses can vary, and not all options are suitable for everyone.

Dr Wod | MED0001783298 | Specialist General Practitioner (FRACGP)

References

Pérez P, Hohman MH. Neck Rejuvenation. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; updated September 4, 2023. PMID: 32965900. Link

Roberts WE, Cheng T. Neck aging and rejuvenation: a balanced approach to assessment and treatment. Dermatological Reviews. 2024;5(3):e238. doi:10.1002/der2.238. Link

Characteristic features of neck aging. Cosmoderma. Link

Hughes MCB, Williams GM, Baker P, Green AC. Sunscreen and prevention of skin aging: a randomized trial. Annals of Internal Medicine. 2013;158(11):781–790. doi:10.7326/0003-4819-158-11-201306040-00002. 

Cancer Council Australia. Fact sheet: Sunscreen. Available at: www.cancer.org.au/about-us/policy-and-advocacy/prevention/uv-radiation/related-resources/fact-sheet-sunscreen

Back to blog

Want to discuss further?

Book your consultation now!

Book Now
Buy a Gift Voucher

FAQ

How does muscle relaxing toxin injection work?

It works by relaxing facial muscles, thereby temporarily reducing and smoothing dynamic frown lines and wrinkles, i.e. those lines caused by movement of the muscles.

Who should not take botulinum toxin?

  • Had an allergic reaction to any of the botulinum toxin products or their ingredients.
  • Have a skin infection at the planned injection site.
  • A disease that affects your muscles and nerves (such as amyotrophic lateral sclerosis [ALS or Lou Gehrig's disease], myasthenia gravis or Lambert-Eaton syndrome).
  • Had any side effect from the product product in the past.
  • A breathing problem, such as asthma or emphysema.
  • Swallowing problems.
  • Bleeding problems.
  • Plans to have surgery.
  • Had surgery on your face.
  • Weakness of your forehead muscles, such as trouble raising your eyebrows.
  • Drooping eyelids.
  • Any other change in the way your face normally looks.
  • Are pregnant or plan to become pregnant.
  • Are breast-feeding or plan to breastfeed.

Do treatment results differ?

Yes, individual results may vary. To get the best results, it's important to go to a doctor who is experienced in administering these injections.

What conditions can be treated effectively with laser therapy?

  • Vascular lesions

Well-defined lesions (abnormalities of the tissue, in this case the skin) that contain blood are usually amenable to laser therapy. These include unwanted blood vessels (‘broken capillaries’) on the face, and birth marks such as port wine stains. Depending on the size of the lesion, the number of laser treatments that are needed can range from 2 to 10 or more.

Laser therapy is also sometimes used for small varicose veins and spider veins.

  • Pigmented lesions

Pigmented lesions that can be treated include: freckles; solar lentigos (liver, or age, spots); flat, pigmented seborrhoeic keratoses (age warts); and café au lait spots (light-tan spots). Laser treatments for pigmented lesions are generally spaced 6 or more weeks apart, to allow your body to get rid of the dispersed pigment.

  • Tattoos/Not currently available

The principle of laser tattoo removal is basically the same as that of the removal of pigmented lesions, but the wavelength of the light beam needs to vary depending on the different ink pigments used in the tattoo. In general, homemade Indian ink tattoos and black tattoos respond most readily to laser removal. White tattoos do not usually respond to treatment. Red is relatively easy to remove, while yellow, orange and green are more difficult.

Skin that has been stained from nasal piercing or from iron injections also usually responds well to laser treatment.

  • Hair removal

Laser-assisted hair removal is both efficient and long term. It works best on thicker, darker hairs, as these hair follicles absorb more light than do smaller, paler hair follicles. Most people find that the amount of hair is reduced by 70 per cent or more after the course of treatment. Laser hair removal also avoids the possibility of ingrown hairs. Sweating changes are sometimes noticed in the treated area.

  • Signs of ageing

Laser resurfacing is used to help reverse the signs of ageing caused by sun damage. Signs of ageing include fine wrinkles and crinkly skin. Resurfacing is also useful in reducing the appearance of acne scars. Following treatment, your skin often takes several weeks to recover.

Laser resurfacing is a safer and more refined procedure than it used to be, but it is still not recommended for people with olive or pigmented skin because of the possibility of uneven skin tone or loss of colour from the skin after treatment.

  • Scars

Whether scars of previous surgery, acne or post burn scar, can all be minimised by laser resurfacing, CO2 fractionated laser is in particular useful for these conditions.

Who can be a good candidate for PDO Lift?

PDO procedures are safe for adults with mild to moderate skin laxity, who keep up with healthy lifestyles and have maintained their weight for at least three months.

Who can be a good candidate for Double chin Treatment ?

The best candidate is an adult 18 years or older with moderate to severe fat beneath the chin. You might not be a good candidate if you have had or are planning to have facial surgery, if you have trouble swallowing, are pregnant or nursing, or have an infection or medical condition in or near the planned injection site.