What role does Helicobacter play in Haut?

Helicobacter pylori is a stomach bacterium linked to several skin conditions, most notably rosacea, chronic urticaria, and atopic dermatitis. The proposed mechanisms include immune modulation, systemic inflammation, and molecular mimicry leading to cross-reactive antibodies. However, the evidence is predominantly observational and case-based; high-quality RCTs are lacking. Eradication therapy may improve symptoms in a subset of patients, but the effect is inconsistent and not generalizable. Importantly, a positive H. pylori test does not confirm a causal role in skin disease. The association is weak to moderate, and other factors (genetics, diet, skin microbiome) are more influential. MyBody-X tests for H. pylori are designed for gastric health, not dermatological assessment. Consumers should be cautious of marketing claims that overstate H. pylori's role in skin conditions. A dermatologist should evaluate any persistent skin issue. Evidence grade: mixed (observational, some interventional but limited).