What Cold Sores And Fever Blisters Reveal About Your Immune System Cold sores and fever blisters aren’t just surface-level nuisances; they’re signs your immune system is struggling. When these blisters appear and linger, it shows your immune cells are becoming overwhelmed and dying. They need help. Understanding what’s really happening gives you the clarity to support your immune system with the tools it needs to finish the fight. Awareness is the first step to strengthening your body. Comment A