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This does not appear to be a cold sore. It is more likely to be an ulcer and swelling caused by local trauma due to biting of teeth. Or it can be an aphthous ulcer. This is not alarming and will heal by itself in a few days. It is not an outbreak of the viral infection. You can safely relax.
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Transmission of the virus is not definite and many such exposures can occur without any transmission. However, the possibility of transmission is present and if he does not get an outbreak within 2 weeks you can safely relax and know that he is not infected with the virus.
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