To effectively manage oily skin, clinical evidence suggests a multi-faceted approach focused on regulating sebaceous gland activity rather than aggressive stripping of the skin barrier. The first line of defence involves the use of topical sebum-regulating agents such as niacinamide (Vitamin B3) and salicylic acid (BHA). Niacinamide has been shown to significantly reduce sebum excretion rates by inhibiting the lipogenesis of sebocytes [1]. Salicylic acid, being lipophilic, can penetrate the pore to dissolve excess sebum and cellular debris, thereby preventing the congestion often associated with an oily complexion [2].
Furthermore, maintaining skin hydration is critical; over-cleansing can lead to reactive seborrhea, where the skin produces more oil to compensate for a compromised lipid barrier. High-quality Australian formulations often incorporate lightweight, non-comedogenic moisturizers containing humectants like hyaluronic acid or glycerine, which provide hydration without adding occlusive weight [3]. Prescription options, such as topical retinoids, also aid by modulating the growth and differentiation of the cells that line the sebaceous follicle, leading to a long-term reduction in visible oiliness [4].
Oily skin, clinically termed seborrhea, is primarily caused by the overproduction of sebum from the sebaceous glands. These glands are densest on the face, scalp, and chest. Sebum is a complex mixture of triglycerides, wax esters, squalene, and cholesterol, which serves to protect the skin and provide antimicrobial properties [1]. However, when hormonal fluctuations—specifically increased androgen levels—stimulate the androgen receptors in sebocytes, sebum production can become excessive [4].
From a biochemical perspective, the enzyme 5-alpha-reductase plays a pivotal role by converting testosterone into the more potent dihydrotestosterone (DHT), which is the primary driver of sebum synthesis. Modern dermatological research focuses on topical inhibitors of this pathway and the use of botanicals like green tea (Epigallocatechin gallate), which possesses anti-androgenic properties to help balance the skin's natural oil production at a molecular level [5].
For those looking to refine their daily routine, Surface Purify is formulated with salicylic acid to help clear congestion and manage excess oil without compromising the skin's integrity. To maintain a healthy equilibrium following a clarifying cleanse, our Balance Biome Crème includes niacinamide to support a calm, more balanced complexion while reinforcing the skin’s natural defence.
FAQ
Can diet influence how oily my skin is?
Yes, emerging evidence suggests a link between high-glycaemic index diets and increased sebum production. High-sugar foods trigger a spike in insulin and insulin-like growth factor-1 (IGF-1), both of which stimulate androgen signalling and sebocyte proliferation [6]. Reducing dairy intake may also help some individuals, as milk contains growth hormones that can exacerbate oiliness and acne [1].
Why does my skin look oilier in the afternoon?
This phenomenon is often due to the circadian rhythm of sebum secretion, which typically peaks around midday. Environmental factors common in the Australian climate, such as high humidity and temperature, further increase the fluidity of sebum, making it spread more easily across the skin surface [2][5].
Does using oil-based cleansers make oily skin worse?
Counter-intuitively, oil-cleansing can be beneficial. Using a formulated emulsifying oil cleanser helps dissolve oxidised sebum and sunscreen more effectively than water-based cleansers alone. However, it is essential to follow with a gentle water-based 'double cleanse' to ensure no residual oil remains to clog pores [3].
References:
[1] Draelos ZD, et al. The effect of 2% niacinamide on facial sebum production. J Cosmet Laser Ther. 2006;8(2):96-101. doi:10.1080/14764170600714568.
[2] Lu J, et al. Salicylic acid as a peeling agent: a comprehensive review. Clin Cosmet Investig Dermatol. 2019;12:455-467. doi:10.2147/CCID.S210301.
[3] Pappas A. The relationship between sebaceous glands and skin barrier function. Dermatoendocrinol. 2009;1(2):77-81. doi:10.4161/derm.1.2.7847.
[4] Zasada M, et al. Retinoids: active molecules influencing skin structure formation in cosmetic and dermatological treatments. Postepy Dermatol Alergol. 2019;36(4):392-397. doi:10.5114/ada.2019.87443.
[5] Saric S, et al. Green Tea and Other Polyphenols in the Treatment of Acne Vulgaris and Seborrhea. Antioxidants (Basel). 2016;5(4):30. doi:10.3390/antiox5040030.
[6] Smith RN, et al. A low-glycemic-load diet improves symptoms in acne vulgaris patients: a randomized controlled trial. Am J Clin Nutr. 2007;86(1):107-115. doi:10.1093/ajcn/86.1.107.
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.
