How Does Oxidative Stress Affect Skin Diseases and How Do Antioxidants Protect?


Our skin is the organ of our body that comes into contact with the outside world and is most exposed to environmental factors. Airborne pollutants, UV rays, cosmetics, food additives, medications, and even some substances produced by the body itself lead to the formation of harmful molecules known as "reactive oxygen species" (ROS) in the skin.

What are ROS?
Reactive oxygen species consist of molecules such as superoxide anion, peroxides, hydroxyl radical (OH°), and singlet oxygen. These molecules affect cell proliferation and survival signals and can cause damage to DNA, cell membranes, collagen structures, and mitochondria.

Our body is equipped with a powerful antioxidant defense system to offset these harmful effects. The skin contains both enzymatic antioxidants (glutathione peroxidase, superoxide dismutase, catalase, etc.) and non-enzymatic antioxidants (vitamin C, vitamin E, vitamin A, carotenoids, melanin, etc.). Additionally, substances we consume through our diet, such as lycopene, green tea polyphenols, grape seed extract, pomegranate, and soy isoflavones, provide antioxidant support to the skin.

So, in which skin diseases does oxidative stress play a role, and how do antioxidants protect? Here are the details, based on scientific data…

What is the role of oxidative stress in contact dermatitis?
Although irritant contact dermatitis (ICD) and allergic contact dermatitis (ACD) occur through different mechanisms, ROS production increases in both. These molecules activate immune cells, trigger inflammation, and weaken the skin barrier.
Some studies have shown that N-acetylcysteine, resveratrol, and tea polyphenols may reduce the severity of contact dermatitis by inhibiting ROS-induced enzyme activation. However, this effect may not always be seen with topical application.

Why is oxidative stress important in alopecia areata?
In alopecia areata, an autoimmune type of hair loss, blood levels of vitamin E, selenium, and glutathione decrease, while oxidative stress markers increase. This suggests that hair follicle cells may be lost through oxidative damage and apoptosis (programmed cell death). Reducing oxidative stress may be a supportive component of treatment.

Is antioxidant balance disrupted in atopic dermatitis?
Levels of vitamins C, E, and A, as well as antioxidant capacity such as glutathione, decrease in individuals with atopic dermatitis. Furthermore, markers of oxidative DNA and lipid damage increase during flare-ups, demonstrating the role of oxidative stress in disease severity.

Is seborrheic dermatitis associated with oxidative stress?
Yes. Total antioxidant levels are decreased in patients with seborrheic dermatitis, while oxidative stress markers are increased. Elevated SOD and catalase activity in the scalp indicates that the body is trying to compensate for the damage.

What is the relationship between lichen planus and DNA damage?
Molecules that indicate oxidative and nitrative DNA damage are increased in patients with oral lichen planus. Interestingly, treatments containing anthocyanins may be as effective as cortisone creams in some cases.

Does antioxidant therapy work in scleroderma?
Oxidative stress markers are elevated in patients with scleroderma. Animal studies have shown that antioxidants such as N-acetylcysteine reduce skin fibrosis and oxidative damage. This is an area that could be further explored in future treatment approaches.

What is the impact of oxidative stress on pemphigus?
In patients with pemphigus vulgaris and foliaceus, vitamin E, vitamin A, and glutathione levels decrease, while lipid peroxidation products increase. This suggests that the immune attack on the skin is amplified by oxidative processes.

What does oxidative stress do in vitiligo?
Hydrogen peroxide (H₂O₂) plays a significant role in melanocyte damage in vitiligo. The Nrf2-ARE antioxidant pathway is one of the protective mechanisms against this damage. Narrow-band UVB therapy can reduce oxidative stress and increase antioxidant enzymes in patients with vitiligo.

What is the role of antioxidants in acne treatment?
Vitamin E, A, and zinc levels decrease in acne patients. Sodium ascorbyl phosphate (a derivative of vitamin C), zinc, and nicotinamide, in particular, are beneficial in acne due to their antioxidant effects. Lactoferrin and carotenoids can also be supportive. However, powerful acne medications such as isotretinoin can increase oxidative stress.

What is the relationship between rosacea and oxidative stress?
In rosacea patients, ROS production increases, while antioxidant capacity decreases. Interestingly, medications used in rosacea treatments, such as metronidazole, tetracyclines, and azelaic acid, also exhibit antioxidant properties.

Conclusion: Combating oxidative stress protects skin health
The role of oxidative stress in the background of many skin diseases has become clear. Proper antioxidant support—both through dietary sources and topical products—can be an important tool in maintaining skin health.