Welcome to our Forum. The lesion you describe could be a HSV lesion or a skin infection. The timing is comptable with HSV however, statistically however, this lesion is unlikely to be HSV-2 but this can happen on rare occasions. The only way to be really sure of what is going on is to have a PCR or culture test with a swab taken from the lesion. I would suggest that you stop applying peroxide and work to get this test done as soon as is possible. This will provide you the best possible result.
A blood test att his time will not help you to diagnose this process.
I hope this comment is helpful. EWH
Thank you doctor.
What about the white pimple like pus? It is my understanding there is none in herpes blisters initially. And the tongue reddening? Is that an indication.
And even if I did peroxide, would a herpes lesion keep growing after a single day?
The reddening of your tongue is not helpful in either instance. Further, as you point out, it would be unusual for a HSV outbreak to present with pus but there is a small chance that this could be HSV non-the-less.
How peroxide impacts HSV lesions is unknown. EWH