Current Insights into the Pathophysiology, Clinical Findings and Prevention Strategies of Diaper Dermatitis

Abstract

Diaper dermatitis is one of the most common inflammatory skin diseases encountered during infancy and presents as a significant health problem, particularly within the first two years of life. Many factors play a role together in the development of the disease, including disruption of skin barrier integrity, prolonged moisture exposure, mechanical friction, prolonged contact with urine and feces, changes in skin pH, and microbial colonization [1,3]. Today, diaper dermatitis is no longer evaluated solely as an irritant contact dermatitis; it is accepted as a multifactorial disease in which skin barrier dysfunction, inflammatory response and microbiota changes act together [3,5]. Disposable baby diaper technologies with high absorbency developed in recent years, hygiene and cleansing products that support physiological pH, and dermocosmetic formulations that support barrier repair have provided significant advances in the prevention of the disease [2,7]. In this review, the current pathophysiology, clinical features and evidence-based prevention strategies of diaper dermatitis are evaluated in light of current literature.

Why Does Diaper Dermatitis Still Retain Its Importance?

Infant skin has a thinner epidermal structure, higher transepidermal water loss (TEWL) and lower tolerance to environmental irritants compared to adult skin. Due to these physiological characteristics, the diaper area is one of the anatomical regions most prone to barrier damage caused by external factors [3].

Although the incidence of diaper dermatitis varies according to the diagnostic criteria used and the population studied, it is reported that a significant portion of infants encounter this condition at least once during the first months of life [2]. The multicenter study by Carr and colleagues showed that not only the technical properties of the diaper, but also diaper changing frequency, cleansing method, caregiver behaviors and skin care routine are determinative in the development of the disease [2]. These findings reveal that diaper dermatitis is a condition closely related not only to the product itself but also to care practices.

The Basis of Pathophysiology: Skin Barrier Disruption

Diaper dermatitis is not the result of a single irritant; it is a complex inflammatory process that develops through the simultaneous effect of physical, chemical and biological factors [3].

The occluded microenvironment formed in the diaper area causes an increase in temperature and moisture. Excessive hydration of the stratum corneum disrupts the intercellular lipid organization between corneocytes, reducing the mechanical durability of the epidermal barrier. As a result, the skin becomes more susceptible to friction and the penetration of irritants is facilitated [3].

Changes in transepidermal water loss and increased epidermal permeability associated with increased moisture facilitate the initiation of the inflammatory process. The study by Berg and colleagues showed that high skin moisture in the diaper area and elevated skin pH are significantly associated with the development of diaper dermatitis [1]. The skin surface, which is normally mildly acidic (pH 5–5.5) under normal conditions, shifts toward an alkaline direction under the influence of urine and feces; this both negatively affects barrier function and increases the activity of protease and lipase enzymes present in feces [1,3].

The conversion of urea in urine into ammonia by bacterial urease, resulting in an increase in pH, accelerates the breakdown of epidermal proteins while also creating a more favorable microenvironment for opportunistic microorganisms [3]. For this reason, pH balance is now considered not only a physiological parameter but also a critical biological target in the prevention of diaper dermatitis.

Microbiota and Inflammation Are Among the Main Factors Determining Disease Severity

Studies conducted in recent years show that diaper dermatitis is not merely a superficial inflammation resulting from irritant contact, but that changes in the skin microbiota occurring for various reasons also play an important role in disease progression [3].

With the disruption of barrier integrity, colonization by Candida albicans in particular increases. In the presence of Candida-related infection, bright red erythema, peripheral satellite papules and pustules are among the typical clinical findings [3,6]. In addition, bacteria such as Staphylococcus aureus and Streptococcus pyogenes can cause secondary infections, deepening the inflammation [6]. Proinflammatory mediators released from keratinocytes due to skin damage increase epidermal inflammation and contribute to the persistence of barrier dysfunction [3]. For this reason, current treatment and protection approaches target not only antimicrobial effect but also the control of inflammation and the restoration of barrier integrity [7].

Clinical Findings Vary According to the Severity of the Disease

Diaper dermatitis generally begins with mild, localized erythema in the areas where the diaper contacts the skin, and in advanced cases, papules, scaling, edema, erosion and superficial ulcerations may develop [4]. Accurate evaluation of the clinical appearance is important for determining disease severity and making a differential diagnosis.

The comprehensive review by Dunk and colleagues emphasizes that in the evaluation of diaper dermatitis, not only the degree of erythema but also the extent of lesions, disruption of skin integrity, pain findings and signs of infection should be evaluated together [4]. In the differential diagnosis, seborrheic dermatitis, atopic dermatitis, contact dermatitis, candidiasis, infantile psoriasis and some rare genetic skin diseases must definitely be taken into consideration [6]. Alternative diagnoses should be reconsidered especially in treatment-resistant cases.

Next-Generation Approaches: Barrier Repair and Protective Formulations

The current approach in the management of diaper dermatitis focuses not only on treating symptoms after a lesion develops, but also on strengthening the skin barrier and preserving its physiological integrity [3]. In this direction, the foundation of protective care consists of changing the diaper at regular intervals, gently cleansing and drying the diaper area, avoiding unnecessary mechanical friction, and using topical products that support barrier function [2,7]. Zinc oxide and petrolatum-based barrier products form a physical protective layer on the epidermis, reducing contact between irritants and the skin, while moisturizing ingredients such as glycerin, panthenol and similar substances support stratum corneum hydration, contributing to the restructuring and protection of the epidermal barrier [7].

Current approaches to protective skin care aim not only to preserve existing barrier integrity but also to support skin biology. In this context, studies on biomimetic lipid systems, ceramide-containing barrier supporters, prebiotic and postbiotic components, and next-generation active ingredients aimed at modulating the inflammatory response are increasingly being carried out [3,7].

Baby wipes have also ceased to be products used solely for cleansing purposes today and have become an important component of care systems that support skin physiology. It has been reported that formulations developed with alcohol-free, physiological skin pH-compatible, low-irritation-potential surfactant systems and appropriate preservative combinations may contribute to the preservation of a healthy skin barrier [2,7]. However, the safety and efficacy of these products should be evaluated not only based on their ingredient composition but together with the results of clinical tolerance, microbiological safety and skin compatibility studies. On the other hand, thanks to the development of super absorbent polymer technologies with high absorbency, it has become possible to effectively remove excess moisture from the skin inside the diaper and to better control the microclimate in the diaper area. These technological developments contribute not only to reducing clinical symptoms but also to reducing the risk of developing diaper dermatitis.

Low irritation potential, compatibility with physiological pH, barrier-friendly surfactant systems, appropriate selection of preservative systems, and clinically verified skin compatibility are among the fundamental design criteria in the development of cosmetic and hygiene products, as well as in the development of next-generation baby care products.

Conclusion

Diaper dermatitis should not be evaluated merely as a simple irritation arising from moisture and friction; it should be addressed as a multifactorial disease in which skin barrier dysfunction, pH changes, enzyme activation, microbiota changes and inflammatory response all play a role together. 

Current scientific data show that protective skin care is a more effective approach than treatment. In this context, disposable diaper systems with high absorbency, cleansing products that support skin physiology, and formulations aimed at preserving barrier integrity play an important role in the prevention of diaper dermatitis. In the future, microbiome-friendly ingredients, biomimetic barrier technologies and clinically verified innovative care products are expected to guide product development efforts in this field.