Abstract
Rosacea is a common inflammatory skin disease, characterized by erythema, papules and pustules. The pathophysiology of rosacea remains unclear, but the complex interplay between environmental and genetic factors may act as a trigger to an abnormal innate immune response associated with a multifaceted neurovascular reaction. Increasing evidence suggests that the gut microbiota is significantly involved in the pathogenesis of rosacea, playing an important role in the inflammatory cutaneous response. Dysbiosis, small intestinal bacterial overgrowth, Helicobacter pylori infection and innate immune system dysregulation mutually contribute to the pathophysiology of rosacea, but more extensive future research is needed to better clarify their precise mechanisms of action. Many dietary triggers have been postulated for this disease; however, there is a lack of well-made and controlled studies able to undoubtedly demonstrate a causal relationship between rosacea and diet. We analyzed the available studies on the role of diet and gut microbiome in rosacea and the positive clinical effects reported by the current literature on probiotics, prebiotics, postbiotics and nutrients. Ultimately, this article improves our understanding of the gut-skin axis in rosacea, focusing on how probiotic supplementation and diet could improve the clinical management of patients affected by this common and debilitating disease.