Cold sore - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/cold-sore/symptoms-causes/syc-20371017
WEBJan 5, 2024 · Cold sores, or fever blisters, are a common viral infection. They are tiny, fluid-filled blisters on and around the lips. These blisters are often grouped together in patches. After the blisters …
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