In most cases, doctors can diagnose oral herpes just by looking at the infection. However, your doctor may want to take a small sample of the infection to test for the herpes simplex virus. Most cold sores go away on their own in about one to two weeks, so it may not be necessary to go to your doctor at all. However, if you have frequent outbreaks, or your symptoms are particularly painful, it may be a good idea to make an appointment to see your doctor.
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