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Background Rosacea is a common condition of unknown aetiology that is usually accompanied by gastrointestinal symptoms and responds favourably to treatment with antibiotics.

Aims/methods This study was designed to examine the prevalence of gastric Helicobacter pylori (Hp) infection verified by ¹³C‐UBT, CLO‐test, Hp culture and serology (IgG and IgA) and the presence of Hp in the oral cavity evidenced by CLO‐test, Hp culture and saliva anti‐Hp antibodies (IgG and IgA). During gastroduodenoscopy antral and fundic biopsy samples were taken for histological evaluation (the Sydney system). This study was performed on 60 subjects 30–70 years old with visible cutaneous rosacea symptoms and 60 age‐ and gender‐matched controls without skin diseases but with dyspeptic symptoms similar to those of rosacea and without endoscopic changes in gastroduodenal mucosa (non‐ulcer dyspepsia – NUD …