I had one of these for months, eventually got it checked and it was a retention cyst. The ENT dr sprayed a numbing spray down my throat, gave it a few minutes to work and then said ‘open wide, but don’t move as I’m going in with this scalpel’! Slight concern as I was on a wheely office chair and what if I a gagged on the scalpel! Luckily all fine took a few seconds and all done. Think I’ve got another one coming as my throat looks like yours at the mo!