Five Mistakes That Are Hurting Your Skin This Summer

Emma Caldwell
August 30, 2026

Summer is the season when we test our skin the most. Our skin quality deteriorates and common symptoms such as dehydration, loss of radiance, dark spots, sensitivity or premature aging appear. However, as explains Vicente Calduch, pharmacist and CEO of Calduch Especialidades, much of these problems can be avoided. «The majority of the damage we see in September is not caused by a single day of sun exposure. They are the result of small cumulative aggressions over weeks: ultraviolet radiation, dehydration, oxidative stress, lack of protection or alterations of the skin barrier».

And to prevent them, the first (and most important) is to use sunscreen daily. Although it may seem an obvious recommendation, it is one of the most common mistakes, as there are still people who only use it when they go to the beach and/or pool. «Cumulative sun exposure is one of the main factors responsible for photoaging, the appearance of dark spots and collagen degradation. Sunscreen protection must be part of the daily routine throughout the summer». Not forgetting reapplication, of course.

Moreover, it is worth keeping in mind that in summer oxidative stress multiplies, so he recommends an antioxidant boost through actives such as vitamin C that helps preserve brightness, improve tone uniformity and promote collagen synthesis. On the other hand, don’t overlook the effects of dehydration. According to Calduch, it is one of the undervalued problems.«Hydration does not depend solely on the amount of water we drink. It is necessary to maintain a strong skin barrier that prevents transepidermal water loss» with ingredients such as squalane, essential fatty acids, vitamin F or vegetable oils rich in physiological lipids.

Nor should we forget that dark spots DO NOT appear suddenly, but begin to activate long before they become visible on the surface of the skin. That is why it is so important to use sunscreen and antioxidants. Finally, the pharmacist is clear with his final recommendation: it is not the moment to experiment. In summer, simple philosophies are best: «the skin appreciates constancy much more than continual changes».

Which cosmetics do you recommend in summer


Light-texture cream from Calduch Laboratories.

Light-texture cream from Calduch Laboratories. Its formula with antioxidant and anti-pollution properties helps prevent signs of aging, while also aiding the reduction of wrinkles and protection.


Comforting Micellar Cleansing Milk from La Biosthetique.

Comforting Micellar Cleansing Milk from La Biosthetique. It is my favorite, a gentle cleanser that calms while effectively removing makeup and dirt; without drying the skin. It leaves a unique feeling of comfort.


Serum SPF 50 from Skin 1004.

Serum SPF 50 from Skin 1004. I like Korean formulas because they are much more complete and minimalist. This sunscreen effectively blocks UV rays and hydrates the skin at the same time, thanks to the exclusive Hyalu-Cica formula. You’ll love it.


Institut Esthederm Intensive NAD+ Niacinamide Serum.

Institut Esthederm Intensive NAD+ Niacinamide Serum. It is the most complete, a ultraconcentrated treatment designed to act at the origin of skin quality. Its formula reactivates the biological regeneration processes that slow down with age and the pace of modern life, boosting the natural production of niacinamide to restore balance and vitality. It is the perfect ally for skins that need an extra cellular energy. Additionally, it leaves an irresistible glass skin finish.

Emma Caldwell
Emma Caldwell
I’m Clara Desrosiers, a writer and fashion editor based in Toronto. I founded Backdoor Toronto to explore the intersection of fashion, identity, and culture through honest storytelling. My work is driven by curiosity, community, and a love for the creative pulse that defines this city.