Rosacea has traditionally been approached as a skin barrier disorder. Impaired barrier function leads to increased transepidermal water loss, reduced hydration, and heightened skin sensitivity. This contributes to chronic inflammation, visible redness, and reactivity.
While this remains true, current research supports a more systemic view. Rosacea is now understood as a chronic inflammatory condition involving immune dysregulation, neurovascular changes, and, in some patients, gastrointestinal involvement.
What is Rosacea?
Rosacea is an inflammatory condition that involves many lens including dysregulation of immune system, genetic, environmental.
Rosacea is a chronic inflammatory dermatosis that primarily affects the central face. It involves both innate immune system activation and vascular instability.
Key pathophysiological features include:
- Upregulation of innate immune responses, particularly increased cathelicidin peptides
- Increased activity of serine proteases such as kallikrein 5
- Neurovascular dysregulation leading to flushing and persistent erythema
- Skin barrier dysfunction with increased transepidermal water loss
Clinical presentation:
- Persistent centrofacial erythema
- Telangiectasia
- Papules and pustules without comedones
- Burning, stinging, and heightened sensitivity
- Ocular involvement in some patients
Triggers and Exacerbating Factors
Rosacea flares are driven by vasodilation and immune activation. Well established triggers include:
- Heat and temperature changes
- Ultraviolet exposure
- Alcohol, particularly red wine
- Spicy foods
- Emotional stress
- Topical irritants or over exfoliation
- Hormonal changes such as perimenopause
- Intense exercise
Types of Rosacea
Rosacea is not a single presentation. It is classified into four main subtypes based on clinical features. Many patients may experience overlap between subtypes.
1. Erythematotelangiectatic Rosacea
This is the most common form and is primarily vascular in nature.
Key features:
- Persistent facial redness, often on the cheeks, nose, and forehead
- Flushing that may come and go, especially with triggers
- Visible dilated blood vessels known as telangiectasia
- Skin sensitivity, burning, or stinging
Clinical notes:
This subtype is driven by neurovascular dysregulation and increased blood flow to superficial vessels. Barrier impairment and increased transepidermal water loss are also commonly present.
2. Papulopustular Rosacea
This subtype includes inflammatory lesions that can resemble acne, but without comedones.
Key features:
- Red inflamed bumps and pustules
- Background redness
- Skin that may feel tender or swollen
Clinical notes:
Inflammation plays a central role, with increased activity of the innate immune system. This subtype is often the one most associated with gut related findings such as small intestinal bacterial overgrowth in the literature.
3. Phymatous Rosacea
This is a less common but more advanced form, characterized by tissue thickening.
Key features:
- Thickened, irregular skin texture
- Enlarged pores
- Most commonly affects the nose, referred to as rhinophyma
Clinical notes:
This subtype involves chronic inflammation leading to fibrosis and sebaceous gland hypertrophy. It is more commonly seen in men and typically develops over time if rosacea is not well managed.
4. Ocular Rosacea
This subtype affects the eyes and surrounding structures.
Key features:
- Dry, irritated, or gritty sensation in the eyes
- Redness of the eyes or eyelids
- Increased tearing or light sensitivity
- Recurrent styes or eyelid inflammation
Clinical notes:
Ocular involvement may occur with or without visible skin symptoms. It is important to recognize, as untreated cases can lead to complications affecting vision.
The Gut Skin Axis in Rosacea
There is increasing evidence that rosacea is associated with gastrointestinal disorders and alterations in the gut microbiome.
1. Small Intestinal Bacterial Overgrowth (SIBO)
SIBO is one of the most studied gut related conditions in rosacea.
- Multiple studies have shown a significantly higher prevalence of SIBO in patients with rosacea compared to controls
- Eradication of SIBO with antibiotics such as rifaximin has been associated with improvement or remission of rosacea symptoms in some patients
- Recurrence of SIBO has been associated with recurrence of rosacea
This suggests a potential causal or contributory relationship in a subset of patients.
Proposed mechanism:
- Bacterial overgrowth increases production of endotoxins such as lipopolysaccharides
- This can increase intestinal permeability
- Translocation of bacterial components can activate systemic immune responses
- Increased circulating cytokines such as TNF alpha and interleukin 6 may contribute to cutaneous inflammation
2. Association with Inflammatory Bowel Disease
Epidemiological studies have identified an association between rosacea and inflammatory bowel disease, particularly Crohn’s disease.
- Patients with rosacea have been shown to have a higher incidence of Crohn’s disease
- Shared inflammatory pathways are suspected, including dysregulation of innate immunity and barrier function
This does not mean rosacea causes inflammatory bowel disease, but it supports the concept of systemic inflammation linking the gut and skin.
3. Helicobacter pylori
The role of Helicobacter pylori remains controversial.
- Some studies have shown higher rates of infection in rosacea patients
- Eradication therapy has led to improvement in some cases
- Other studies have not found a consistent association
At this time, testing is generally considered when gastrointestinal symptoms are present.
Mechanistic Summary
The gut skin connection in rosacea is likely mediated through:
- Increased intestinal permeability
- Systemic immune activation
- Circulating inflammatory mediators
- Altered microbiome composition
These factors may amplify cutaneous inflammation in susceptible individuals.
Evidence Based Integrative Approaches
Management should be individualized and based on clinical presentation.
1. Identify and Treat Underlying Gut Conditions
- Consider assessment for SIBO in patients with bloating, gas, or altered bowel habits
- If confirmed, targeted treatment may be warranted
- Address Helicobacter pylori when clinically indicated
2. Support Microbiome Balance
- Specific probiotic strains may help regulate immune responses and support barrier integrity
- Evidence is strain specific, and not all probiotics will have the same effect
3. Improve Gut Motility
- Constipation and slow transit can contribute to microbial imbalance
- Supporting regular bowel movements may reduce fermentation and endotoxin production
4. Dietary Interventions
Diet should be tailored rather than generalized.
- Low FODMAP diet may be helpful in patients with confirmed or suspected SIBO
- Anti inflammatory dietary patterns may support overall immune regulation
- Identify and reduce individual triggers such as alcohol, spicy foods, and histamine rich foods
5. Reduce Systemic Inflammation
- Stress management is important due to its impact on both gut permeability and immune activation
- Sleep and lifestyle factors play a role in inflammatory regulation
Final Thoughts
Rosacea is not solely a disorder of the skin. It is a condition involving immune, vascular, and, in some cases, gastrointestinal systems.
The association between rosacea and gut health is supported by clinical and mechanistic evidence, particularly in relation to small intestinal bacterial overgrowth. However, this relationship is not universal and should be assessed on an individual basis.
A targeted and evidence informed approach that considers both cutaneous and gastrointestinal factors may provide more effective long term management.
About the author:
Hi, I’m Abinaa, a fourth-year naturopathic medical student at the Canadian College of Naturopathic Medicine with a deep-rooted passion for natural healing, inspired by my South Asian upbringing. Through this blog, I hope to share my journey, explore topics in holistic health and wellness, and offer simple, thoughtful insights that support a more balanced and mindful way of living.
