They are not the same. A cold sore is a virus, herpes simplex virus-1. Causes are common cold, fever, flu, sun exposure, stress, hormonal changes, and trauma to area. A canker sore is from stress, infection, vitamin deficiencies, hot spicy foods and a build up of acid in saliva. Both are treatable but only the cold sore is contagious.
Answered 7/27/2023
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