Literally its more like "external attacks", but usually in English skincare marketing we talk about "damage" in this kind of context.

Hi!

You could also refer to "effects".

I know this seems strange but I have done a lot of cosmetic translations and this term is commonly used:

Every day, skin and hair are subjected to many stress and environmental factors such as pollution, heat, radiation (UV, infrared, etc.), chemical products or microorganisms (bacteria, yeasts, etc.). As these external aggressions are considered as factors of oxidative stress, inflammation or DNA damages, they can alter skin quality, increase skin sensitivity and lead to premature ageing.

To fight these aggressions, the skin has innate defense and protection mechanisms, on which an active ingredient or cosmetic compound can have an effect: pH, commensal flora, sebum, antimicrobial substances, antioxidant enzymes, detoxification enzymes, immune cells, etc
https://www.bioalternatives.com/en/cosmetic-claims/skin-prot...

However, skin aging and external aggressions are crucial factors that prevent the skin’s hydrolipidic film (protective film covering the skin’s surface) from playing its role of protective barrier and water loss regulator.
https://www.neutrogena.ca/beauty-and-skincare-tips/managing-...

Prebiotics such as Lactitol and Xylitol are moisturising substances that selectively protect and restore the skin microbiota, which forms part of the skin’s defence mechanisms against external aggressions. They help to restore the balance of the skin’s ecosystem by promoting the growth of beneficial germs to the detriment of harmful germs. Their selectivity is based on the ability of these germs to transform enzymatic polyols into assimilable sugars.
https://www.martiderm.com/en/active-ingredients/prebiotics

attacks is also used but aggressions is used more often.

In the present study, two research groups led by Yenan Bryceson and Liv Eidsmo show how these two subgroups of T cell operate to protect healthy skin from external attacks and retain their unique functions in psoriasis and vitiligo.
https://www.sciencedaily.com/releases/2017/02/170220085304.h...

We talk about environmental factors, so I would say "external elements", such as sun and wind.

Best Facial Cream 2020: Shopping Guide & Review ...www.glamourpilot.com › Facial Care
Jun 16, 2020 - Our skin protects us against infections by regulating our body ... of the body and the most vulnerable to the **external elements.** ... Face Cream Moisturizer (1.7 OZ) Natural Anti Aging Skin Care ... The unique water gel formula absorbs quickly like a gel, but has the ... Coenzyme Q10, Reduces signs of aging.


Review, Swatches: Eucerin Calming, Repair, Soothe, Daily ...www.beautystat.com › body › review-swatches-eucerin...
Jul 17, 2013 - Skin Calming Daily Moisturizing Creme w/ Natural Oatmeal and Rich ... Provitamin b5 and shea butter help skin's protective barrier against ***external elements.*** It quickly absorbs into skin with its non-greasy formula, making it a great ... and fragrance-free, this daily body lotion will protect skin against sunburn.


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Note added at 58 mins (2020-08-11 14:24:27 GMT)
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Cracked lips: balms and treatments - Eucerinint.eucerin.com › products › lip-care
... Eucerin pH5 · Anti-Pigment · Hypersensitive Skin · Lipo-Balance · Q10 Active ... We recommend year-round sun protection with products suitable for dry skin and ... ***constant contact with wind, sunlight and harsh external elements***, which leave ... used as cream and lip balm for psoriasis and other uncomfortable conditions, ...


3 methods Finding Body Creams For Firmer And Smoother Skin ...bigboostusa.com › dating & relationships
Encounter deals with ***external elements like the sun, smoke and carbon dioxide.*** ... A component called coenzyme q10 (COQ10) just what Skin Care products ...

I provide a link on the reference I found on Eucerin webpage