Rosacea
vessels in the face, and sometimes small bumps filled with pus. Less commonly, rosacea can also lead to a thickening of the skin on the nose. While experts aren’t sure what causes this condition—which hits approximately 14 million Americans—they theorize that genetics, abnormal facial blood vessels, and possibly even the gut bacteria H. pylori may play a role. The National Rosacea Society explains that antibiotics used to treat rosacea may be effective because they help to combat inflammation, not because they’re killing bacteria.