Avoiding Hidden Chemicals in Cosmetics That Cause Eczema, Dermatitis, and Irritation

Parabens (e.g., methylparaben, propylparaben) are widely used as preservatives to prevent microbial growth in cosmetics. However, studies have indicated that these compounds tend to disrupt hormone functions and majorly contribute to skin irritation, particularly in individuals with sensitive skin. ³ Other preservatives, such as methylisothiazolinone (MI) and methylchloroisothiazolinone (MCI), have often been associated with severe allergic reactions and dermatitis.

Sodium lauryl sulfate (SLS) and sodium laureth sulfate (SLES) are commonly found in cleansers, shampoos, and facial washes. These are surfactants that strip away natural oils of the skin, disrupting its barrier and leading to irritated, dry skin. ⁵ People prone to eczema often experience flare-ups when exposed to sulfates; hence, sulfate-free alternatives are a better choice for such individuals.

Some cosmetics preservatives gradually release formaldehyde, which is a known skin irritant and a potential carcinogen (cancer-causing agent). Ingredients such as DMDM hydantoin.

Denatured alcohol (alcohol denat.), ethanol, and isopropyl alcohol are often used in toners, serums, and hair products. While they are amazing at providing a quick-drying effect, they can also dehydrate the skin and exacerbate irritation, particularly in individuals with pre-existing conditions like eczema. ⁷ However, fatty alcohols such as cetyl and stearyl alcohol are generally well-tolerated and can even be beneficial.

The first step in avoiding harmful chemicals is understanding the ingredient labels. To minimise exposure to potential irritants, consumers should look for products labeled "fragrance-free," "paraben-free," and "sulfate-free".

Brands that collaborate with dermatologists for conducting extensive product testing and gaining hypoallergenic certifications are likely to be free from common irritants. Products with short ingredient lists tend to be less likely to cause reactions. ⁸

Before incorporating a new product into a skincare routine, a patch test on a small area of skin (such as the inner forearm) can help detect any potential irritation before full application.

While "natural" does not always mean "safe," many plant-based and minimalist skincare products exclude synthetic preservatives, fragrances, and harsh surfactants. Look for products containing soothing ingredients like colloidal oatmeal, aloe vera, and ceramides to support the skin barrier.

Hidden chemicals in cosmetics can significantly impact skin health, leading to conditions such as eczema, dermatitis, and chronic irritation. Consumers should educate themselves about common irritants and carefully select products that prioritize skin safety. By choosing fragrance-free, sulfate-free, and dermatologist-recommended formulations, individuals can reduce the risk of adverse skin reactions and maintain healthier, more resilient skin.

Ananthapadmanabhan, K. P., Moore, D. J., Subramanyan, K., Misra, M., & Meyer, F. (2021). Cleansing without compromise: The impact of mild surfactants on the skin barrier. Journal of Dermatological Science, 105(2), 77-85.

Darbre, P. D., & Harvey, P. W. (2022). Parabens and human health: Urgent regulatory action needed. Environmental Health Perspectives, 130(3), 035001.

de Groot, A. C., White, I. R., & Flyvholm, M. A. (2022). Formaldehyde-releasing preservatives: How much is too much? Contact Dermatitis, 87(1), 1-12.

Goossens, A. (2020). Fragrance contact allergy: A worldwide concern. Current Allergy and Asthma Reports, 20(10), 48.

Johansen, J. D., Frosch, P. J., & Lepoittevin, J. P. (2021). Contact allergy to fragrances: A European overview. Contact Dermatitis, 84(2), 85-97.

Loden, M., & Maibach, H. I. (2021). Dry skin and moisturizers: Chemistry and function. CRC Press.

Smith, C. H., McFadden, J. P., & Basketter, D. A. (2021). Hypoallergenic cosmetics: What does it really mean? British Journal of Dermatology, 185(4), 789-795.

Uter, W., Geier, J., & Schnuch, A. (2019). Contact allergy to preservatives: What has changed? Journal of Allergy and Clinical Immunology, 143(5), 2002-2004.