A little white bump that isn't fluid filled isn't herpes. That could have been a clogged oil gland, or just an oil gland that was irritated, so therefore more noticeable.
It could have been a pimple, or a wide variety of other things.
If it didn't blister and form a scab, it wasn't an oral hsv1 outbreak.
However, if you have trauma to the area (a cut or sore from something else), that may trigger shedding. If your partner already has hsv1, they can't get it again genitally. Do you know if they've been tested or if they have it?
No one knows how much virus needs to be present in order to transmit, and it's probably different for everyone and every circumstance.