So sorry for the delay- I now see the pic as it was sent to me from the moderator.
I have to say it looks pretty suspicious for oral herpes lesions.HSV is the virus that causes "cold sores". Generally lesions go away within a few days. Taking an oral antiviral medicine ( Zovirax or valtrex) may speed recovery by about 1 day- but does not have a huge impact.
And of course it can recur- sometimes with precipitating events like UV exposure, or stress, or a weakening of the immune system, and sometimes for no reason at all..
Generally once you are infected with the HSV virus, it is always there- although it goes into a dormant phase between outbreaks.
If you do have frequent outbreaks it may be reasonable to talk to your doctor about taking an antiviral medication prophylactically.
While I say this based on the appearance, if you wanted to be absolutely sure, your doctor could do a viral and bacterial culture for confirmation.
I hope this helps. Good luck
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