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  1. Cold sore - Symptoms and causes - Mayo Clinic

  2. How to Tell if You Have a Cold Sore (with Pictures) - wikiHow

  3. Cold Sore Stages: Identification and Treatment - Healthline

  4. 5 Stages of Cold Sores and What to Do - NewMouth

  5. Cold Sores - WebMD

  6. Cold Sore: Symptoms, Causes & Treatment - Cleveland Clinic

  7. Cold sores: Signs and symptoms - American Academy of Dermatology

  8. Cold Sores | UMass Memorial Health

  9. Cold Sores: Symptoms, causes, treatments, and your questions

  10. Cold sores - NHS

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