alarming bubble like lump on inner foreskin of penis

for context me and my gf both got a full std screen a few months ago and everything was negative. i have no idea what this is. i just had balanitis this week and it as soon cleared up this appeared last night. super alarming. please help! (the other bubble has been there my whole life)

image

and for context, this is a painless mark, which leads me to believe it mag be syphilis. getting tested today.

any update? I have something similar