1 doctor weighed in:

When is a cold sore lesion no longer contagious? I know herpes can be transmitted regardless, but want to know when an actual cold sore is ok.

1 doctor weighed in
Dr. Robert Killian
General Practice

In brief: Herpes Is Confusing

There is no answer to your question.
There is no known way to predict if a cold sore is also shedding virus or not. It can be both.

In brief: Herpes Is Confusing

There is no answer to your question.
There is no known way to predict if a cold sore is also shedding virus or not. It can be both.
Dr. Robert Killian
Dr. Robert Killian
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