Evidence check: Helicobacter in the context of Haut

The question of Helicobacter in the context of skin (dermatological conditions) is scientifically relevant, but the evidence is mixed. Helicobacter pylori, a stomach bacterium, has been associated with some skin diseases such as chronic urticaria, rosacea, and less commonly psoriasis or atopic dermatitis. The proposed mechanisms involve the gut-skin axis, immune modulation, or inflammatory mediators. However, most studies are observational, with conflicting results and no clear causality. A DNA test for Helicobacter is not useful – diagnosis is made via breath test, stool antigen, or biopsy. Genetic variants (e.g., in IL-1β or TLR4) may influence susceptibility to H. pylori infection but do not predict skin conditions. The evidence is insufficient to recommend routine eradication for skin diseases, except in confirmed infection with specific indications. Caution against overinterpreting genetic tests: most skin issues are multifactorial. If symptoms are present, a doctor should be consulted.