Dull skin after summer: how to rejuvenate it in September

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Why September is the right time for a skin reset

Every year, when September comes around, I find myself taking stock of the same things: during summer, my skin seems to “hold up” well. My complexion looks more even, small areas of redness are less noticeable, and there’s that golden glow everyone loves. But from personal and professional experience, I know it’s only a temporary illusion.

Behind that tan, there’s often a weakened skin barrier, signs of dehydration, and the early stages of lost elasticity. I see it in myself and in the people I work with: men and women of different ages and skin types often experience similar issues in September.

That’s why I consider this month a true skin check-up: it’s time to repair, replenish what your skin has lost, and prepare it for autumn.

What really happens to your skin in summer

When I talk about summer damage, I’m not referring only to sunburn, which is serious and should always be avoided, but to a combination of micro-stressors that build up:

• UVA and UVB rays: penetrate the skin layers, causing oxidation and the breakdown of collagen and elastin.
• Wind and salt: increase transepidermal water loss (TEWL), leaving skin drier and more reactive.
• Chlorine: disrupts the skin’s natural pH and compromises the barrier.
• Pollution: adds to the oxidative burden.

The result is skin that, after returning from vacation, looks dull, less elastic, with an uneven texture and prone to dryness. Sometimes spots and discoloration also appear, especially if sun protection hasn’t been consistent.

How to tell if your skin needs a reset

• Dullness: your skin no longer reflects light the way it did in June.
• Tight-feeling skin: a sign of moisture loss.
• Uneven texture: more visible pores and less smooth skin.
• Discoloration: spots become more noticeable as your tan fades.
• More pronounced fine lines: often linked to summer oxidative damage.

It’s not just about appearance: these are signs of functional impairment.

A note on dullness: in September, the main cause is dehydration of the stratum corneum, which is why recovery is quick. But there are four possible mechanisms, each requiring a different approach: I’ve broken them down one by one in dull skin: causes and remedies. If your complexion hasn’t improved after six weeks of following the routine, the cause wasn’t seasonal.

My September routine: four steps

Over time, I’ve developed a simple approach, suitable for both men and women, that works because it addresses the skin’s real needs after summer.

1. Gentle cleansing

I use cleansers with gentle surfactants and a skin-friendly pH. L’s goal is to cleanse without weakening the skin barrier. If your skin is very dry, I recommend double cleansing: first with a cleansing oil, then with a mousse cleanser.

2. Smart exfoliation

After summer, I prefer gentle exfoliants such as mandelic acid or PHAs, which renew the skin without stressing it. Once or twice a week is enough: right after summer, skin is more fragile than it seems, and over-exfoliating is the most common September mistake.

3. Intensive restorative treatment

This is where SkinAge Advance comes in: a single-use mask we designed to give skin deep hydration, immediate comfort, and barrier support in one application. For me, it’s the perfect post-summer booster: I use it during the first few weeks of September, following the schedule below.

4. Daily hydration and protection

Serum and moisturizer with hyaluronic acid are the foundation for rebuilding the skin barrier and keeping skin supple.

And I never forget sun protection: even in the city and on cloudy days. It’s the step that makes the rest of the routine either effective or pointless.

The ingredients I rely on at this stage

• Hyaluronic acid: immediate, long-lasting hydration.
• Ceramides: essential for rebuilding the skin barrier.
• Niacinamide: improves elasticity and evens skin tone.
• Peptides: support the processes involved in collagen and elastin synthesis.
• Antioxidants: stabilized vitamin C and ferulic acid to protect and brighten.

How to incorporate SkinAge Advance into your routine

• Weeks 1-2: SkinAge Advance twice a week, after cleansing and exfoliating.
• Weeks 3-4: maintenance with one application per week.
• Daily routine with barrier cream and SPF.

A mistake I often see in September is trying to make up for everything in two weeks by layering exfoliants, acids, and intensive treatments. After summer, the skin barrier has been put to the test: introducing too many active ingredients at once can make things worse instead of solving the problem. Four to six weeks of a few consistent steps is better.

Lifestyle makes a difference

Skin care isn't just external:

• I drink enough water every day.
• I add antioxidant-rich fruits and vegetables.
• I get omega-3s from fish or oilseeds.
• I maintain a healthy sleep-wake cycle: skin regenerates at night.

Frequently asked questions

Why does skin get worse in September?

Because the cumulative effects of sun, wind, chlorine, and pollution become apparent: the skin barrier is weakened and hydration is reduced.

Is SkinAge Advance also suitable for men?

Yes: men's skin has the same hydration and repair needs after summer.

Do you still need sun protection in the fall?

Yes, because UVA rays are present year-round and contribute to skin aging.

References

• Rittié L, Fisher GJ. Natural and sun-induced aging of human skin. Cold Spring Harbor Perspectives in Medicine, 2015.
• Proksch E, Brandner JM, Jensen JM. The skin: an indispensable barrier. Experimental Dermatology, 2008.
• Lin FH et al. Ferulic acid stabilizes a solution of vitamins C and E and doubles its photoprotection of skin. Journal of Investigative Dermatology, 2005.

On the website: Dull skin: causes and remedies · skin barrier · LeLang partner pharmacies

Elisa Avalle, founder of LeLang Skin Care