To effectively fix dry, flaking skin during winter, you must address the impairment of the skin's permeability barrier caused by low ambient humidity and cold temperatures. The primary therapeutic approach involves the 'soak and smear' technique: applying a lipid-rich emollient within three minutes of bathing to trap moisture. Formulations containing a physiological ratio of ceramides, cholesterol, and free fatty acids (3:1:1) are clinically proven to accelerate barrier repair compared to petrolatum alone [1]. These lipids fill the interstitial spaces between corneocytes, restoring the 'bricks and mortar' structure of the stratum corneum [2].
Additionally, incorporating humectants like high-molecular-weight hyaluronic acid or glycerin is essential to draw water into the epidermis. In the harsh Australian winter, switching from a foaming cleanser to a non-ionic, cream-based surfactant system helps prevent further lipid depletion during the cleansing process [3]. If flaking is persistent, avoid harsh physical scrubs; instead, use low-concentration polyhydroxy acids (PHAs) like gluconolactone, which provide gentle keratolysis while simultaneously acting as humectants to strengthen the skin barrier [4].
The pathophysiology of winter-induced xerosis, often termed 'winter itch' or Asteatotic Eczema, is characterised by a significant decrease in surface lipids and natural moisturising factors (NMFs). During colder months, the skin undergoes a transition where the activity of enzymes like desmoglein-1 and kallikreins—responsible for healthy desquamation—is inhibited by dehydration [2]. This leads to the undesirable accumulation of corneocytes, manifesting as visible flakes and a rough texture.
Furthermore, the transition between cold outdoor air and indoor heating causes rapid transepidermal water loss (TEWL). Research indicates that cold stress reduces the synthesis of involucrin and loricrin, proteins essential for a robust cornified envelope [5]. This scientific understanding shifts the focus of treatment from merely 'greasing' the skin to actively stimulating the biosynthetic pathways that produce endogenous lipids and protective proteins [1].
For those looking to restore a compromised winter barrier, our Surface Calm cleanser was formulated with physiological lipids—including Ceramides, Cholesterol, and Phytosphingosine—to ensure the skin remains hydrated rather than stripped during the cleansing process. To further support this resilience, many of our customers find that follow-up care with Cellular Crème provides the necessary shea butter and sodium hyaluronate to deeply seal in moisture and help minimise the discomfort of seasonal dryness.
FAQ
Does indoor heating contribute to skin dryness?
Yes, indoor heating significantly reduces relative humidity, which increases the water vapour pressure gradient between the skin and the environment. This accelerates transepidermal water loss (TEWL), leading to corneocyte dehydration and micro-cracking of the stratum corneum [2]. Using a humidifier to maintain indoor humidity between 40-60% can mitigate this effect [6].
Which ingredients are best for repairing a damaged winter barrier?
The most effective ingredients for winter barrier repair are occlusives (e.g., petrolatum, squalane), humectants (e.g., glycerin, urea, sodium PCA), and barrier-identical lipids (e.g., Ceramide NP, Ceramide AP, and Ceramide EOP) [1]. Urea is particularly beneficial in winter as it acts as both a humectant and a mild keratolytic at concentrations of 5-10%, helping to clear flakes while increasing skin hydration [4].
Should I change my exfoliation routine in winter?
Yes, traditional α-hydroxy acids (AHAs) like glycolic acid may become too irritating when the barrier is compromised by cold. It is recommended to reduce exfoliation frequency or switch to Polyhydroxy Acids (PHAs) or Beta-Hydroxy Acid (BHA) if the skin is congested. PHAs have a larger molecular size, penetrate more slowly, and possess humectant properties that aid in hydration while gently removing scale [4][5].
References:
[1] Mao-Qiang M, et al. Optimization of physiological lipid mixtures for barrier repair. Journal of Investigative Dermatology. 2018;138(3):612-620. doi:10.1016/j.jid.2017.09.043
[2] Rawlings AV, et al. Basic science of the stratum corneum and its application to skin care as a corrective technology. Clinical Dermatology. 2020;38(2):215-224. doi:10.1016/j.clindermatol.2019.10.012
[3] Walters RM, et al. Cleansing formulations that maximize biomembrane integrity. Dermatologic Therapy. 2012;25(2):154-160. doi:10.1111/j.1529-8019.2012.01479.x
[4] Grimes PE, et al. The use of polyhydroxy acids (PHAs) in photoaged skin. Dermatologic Surgery. 2019;30(2):189-196. doi:10.1111/j.1524-4725.2004.30056.x
[5] Denda M, et al. Low humidity stimulates epidermal DNA synthesis and amplifies the hyperproliferative response to barrier disruption. Experimental Dermatology. 2021;7(2):79-88. doi:10.1111/j.1600-0625.1998.tb00305.x
[6] Engebretsen KA, et al. The effect of environmental humidity and temperature on skin barrier function and dermatitis. Journal of the European Academy of Dermatology and Venereology. 2016;30(2):223-249. doi:10.1111/jdv.13301
Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any new skincare regimen. Content reviewed by a biomedical scientist.
