Forehead wrinkles: why they form and what can be done

The forehead is the area of the face where wrinkles appear earliest, and not because of age. This is because the frontalis muscle is thin, broad, and attached directly to the skin: every time it contracts, the crease is transmitted to the surface without any cushion to absorb it.

That is why two things matter on the forehead more than elsewhere: how many times a day that muscle works, and why. A significant proportion of contractions are not expressive but compensatory: the eyebrows are raised to see better, and we frown in bright light. These can be addressed without buying anything.

Article written by Elisa Avalle, founder of LeLang Skin Care and a dermocosmetics specialist. Cover image generated with the support of artificial intelligence.

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Two types of wrinkle, two different muscles

The forehead has two types of furrows that are often confused and respond differently.

Horizontal lines run across the forehead from one side to the other. They depend on the frontalis muscle, which raises the eyebrows. The crease is perpendicular to the direction of the fibers, so it is horizontal.

Vertical lines between the eyebrows, called glabellar lines, depend on different muscles, those that draw the eyebrows together and pull them down. They are the deepest and most resistant because those muscles are thicker and their contraction is more concentrated.

In practice, this means that a cream can produce noticeable results on young horizontal lines and far less on deeply etched glabellar lines. This is not a flaw in the product: they involve two different mechanisms.

The distinction between a furrow that is still dynamic and one that has become permanent is explained in expression lines and static wrinkles, and it is the first check to make before choosing a product.

Causes unrelated to age

The forehead has more modifiable factors than other areas, and it is worth listing them before discussing active ingredients.

• Uncorrected vision. People with an uncorrected vision problem squint and raise their eyebrows dozens of times an hour. It is the most underestimated cause of all, and it can be addressed by an optician, not in a perfumery.
• Bright light without sunglasses. The same mechanism, plus the direct damage caused by ultraviolet radiation.
• Screen height. A monitor that is too low makes you lower your gaze and frown; one that is too high makes you raise your eyebrows. Both positions, maintained for eight hours a day, matter.
• Concentration-related tension. Many people frown while reading or driving without realizing it.
• Photoaging. The forehead is one of the most exposed areas of the face and one of the least protected, because sunscreen often stops at the hairline.

None of these points requires a product. All five reduce the number of daily contractions, and that is the factor that determines how quickly a dynamic wrinkle becomes static.

What a cosmetic product can do

Three approaches, with different results.

Reduce the extent of the contraction. This is the role of peptides that interfere with signal transmission at the neuromuscular junction, such as Acetyl Hexapeptide-8. The available efficacy data come largely from manufacturers' tests: the effect is measurable, gradual, and reversible, and is not comparable to an injectable treatment.

Strengthen the structure beneath the crease. Retinoids, vitamin C, and signal peptides such as Matrixyl act on matrix synthesis. It is the slowest and most robust lever: assess it after three months, not three weeks.

Improve the way the surface reflects light. Well-hydrated skin makes the crease less noticeable. It is a real but daily effect that is lost if you stop.

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«Before looking for a forehead cream, it is worth having your eyesight checked. That is the advice that saves the most money of all.»

How to apply it, since the forehead is often forgotten

It is the area that receives the least product of all, because the usual application focuses on the cheeks and eye contour.

Apply the serum by moving upward from the center of the forehead toward the hairline, using vertical movements without pulling the skin downward. On the glabella, work in the product with your fingertips, because this is where the least product reaches.

Sunscreen should be applied up to the hairline and on the temples. In this area, quantity matters: most people apply far less than the amount used to measure the stated SPF. The criteria for choosing it are explained in how to choose facial sunscreen.

A practical detail: if you use a retinoid, start by applying it to the forehead every other day. The skin in this area is thinner than you might think, and flaking is very noticeable here.

Elisa's note

When someone shows me their forehead wrinkles during a consultation, the second question I ask is whether they wear sunglasses. The answer is almost always only in summer. The frontalis muscle works all year round, and January light in the middle of the morning is enough to make it contract.

When cosmetics aren't enough

It must be said plainly. For a deep glabellar wrinkle that is etched in and visible at rest, no topical product produces a correction comparable to a medical treatment. A cosmetic product improves its appearance because the surrounding skin is more supple and hydrated, not because the furrow has been reopened.

If the goal is a noticeable correction within a few weeks, the right person to consult is a doctor. If the goal is to slow the deepening of lines that are still dynamic and maintain the result over time, cosmetics are the right tool and the only sustainable option for years.

The two things aren't mutually exclusive: people who undergo medical treatments achieve longer-lasting results if the surrounding skin is well maintained.