Why Facial Lines Form: The Skin Science in Plain English

Facial lines form when skin loses its structural support and repeated movement folds it in the same places. Collagen and elastin, the proteins that give skin firmness and spring, decline with age. UV exposure and smoking speed that decline up. Meanwhile, every expression creases the skin along the same paths. Over time those creases stop smoothing out. You can’t stop ageing, but you can influence several of these factors.

The structure of your skin

Skin has three main layers:

• Epidermis. The thin outer layer that protects you and keeps moisture in
• Dermis. The middle layer, rich in collagen (for strength and firmness) and elastin (for stretch and recoil), along with hydrating molecules that help hold water
• Subcutaneous layer. Fat and connective tissue that cushion and support the skin

Lines appear when this system weakens. The dermis thins, collagen and elastin become fewer and more disorganised, and the skin holds less moisture.

What drives facial lines

Natural ageing

From early adulthood, the body gradually makes less collagen. Skin becomes thinner, drier and less elastic, and it repairs itself more slowly. This “intrinsic” ageing happens to everyone. Its pace is partly genetic.

UV exposure

Ultraviolet radiation from the sun penetrates the skin and damages collagen and elastin. It also triggers enzymes that break them down further. This is called photoageing. It shows as lines, rough texture, uneven pigmentation and loss of firmness, and it’s most visible on the face, neck, chest and hands. Australia has some of the highest UV levels in the world, so sun protection matters year-round in Adelaide.

Facial expression

Frowning, squinting, smiling and raising your eyebrows fold the skin along the same lines thousands of times. In younger skin, those folds smooth out. As collagen and elastin decline, they begin to stay. That’s why lines tend to appear first where we’re most expressive: between the brows, across the forehead and at the corners of the eyes.

Genetics

Skin type, thickness, natural oil production and how expressive you are all influence when and where lines appear. Two people with similar habits can age quite differently.

Smoking

Smoking is linked to premature skin ageing. It narrows blood vessels, reducing oxygen and nutrients reaching the skin, and it damages collagen and elastin. The repeated pursing of the lips also contributes to lines around the mouth.

Other factors

Dehydrated skin, significant weight change, poor sleep and environmental pollution can also affect how lines look.

Prevention: what actually helps

• Daily sun protection. Use a broad-spectrum sunscreen of SPF 30 or higher every day on your face, neck and hands. Reapply it outdoors, and add a broad-brimmed hat and sunglasses. Cancer Council Australia recommends sun protection whenever the UV index is 3 or above.
• Don’t smoke. Quitting at any age helps your skin and your overall health. Quitline is available on 13 7848.
• Moisturise. A moisturiser or hydrating serum supports the skin barrier and softens the look of fine lines.
• Consider over-the-counter actives. Ingredients such as retinol and vitamin C are widely used for skin texture. Introduce them gradually and stop if your skin becomes irritated. Some medical treatments your GP or dermatologist may discuss aren’t available over the counter.
• Look after the basics. Sleep, a balanced diet and managing squinting with sunglasses or an eye test all support your skin over time.

Skin treatments

Some non-prescription treatments work on skin texture and fine lines, including chemical peels, skin needling and laser and light treatments. They work on the skin rather than on facial movement or deeper structures. Results vary, and they’re often done as a course of several sessions, which your practitioner will advise on. Each carries risks, such as redness, irritation and pigment changes. Recovery varies; your practitioner will explain what to expect.

When to consider a consultation

If lines bother you, a consultation with a registered health practitioner can help you understand what’s driving them, whether that’s expression, skin quality, volume change or a mix. They can then explain which options may suit you, along with the risks, costs and alternatives, including doing nothing. Treatments that involve prescription medicines can only be considered after an in-person consultation with an appropriately qualified, registered health practitioner. Cosmetic consultations are for adults aged 18 and over.

Risks and suitability

Every cosmetic treatment carries risks, and results vary between people. Pregnancy, breastfeeding, some skin conditions and some medicines can affect which treatments are suitable.

Before you book

• Check the practitioner on the Ahpra public register. See our registration-check guide.
• Ask about their registration type and all your options, including not having treatment
• Get costs in writing, and take time to decide

Request a consultation

Tell us what you’d like to discuss and we’ll get back to you within 24–48 hours to arrange a no-obligation consultation. Requesting a consultation is free and there’s no obligation; any consultation fee is confirmed before you book.

Request a consultation or read about the Lines & Wrinkles Consultation.

See also: what to expect at a lines and wrinkles consultation, frown lines: causes and options.

Frequently asked questions

What causes wrinkles and facial lines?

Lines form as skin loses collagen and elastin with age and sun exposure, while repeated facial expressions crease the same areas over and over. Genetics, smoking, pollution and skin dryness also contribute.

Is sun exposure really the biggest factor I can control?

UV exposure is one of the main controllable causes of premature skin ageing. Daily broad-spectrum SPF 30 or higher, a hat and sunglasses, and seeking shade are among the most effective habits for protecting your skin.

Does smoking cause wrinkles?

Smoking is linked to premature skin ageing. It reduces blood flow to the skin and damages collagen and elastin, and the repeated pursing of the lips adds to lines around the mouth.

Can skincare get rid of lines?

Skincare can improve hydration, texture and the look of fine lines, and sunscreen helps prevent further damage, but it won't erase deeper lines. A practitioner can explain what's realistic for your skin.

When should I consider a consultation?

If lines bother you and you'd like to understand your options, a consultation with a registered health practitioner can explain what's driving them and which options may suit you, including doing nothing.