I am a heterosexual male. I have had (given) oral sex with four different female partners. On each occasion, a few days afterwards, I have developed the same symptoms: swollen tonsils with white spots, with no other symptoms (no sore throat, no cold or flu symptoms, etc). Because of this I have very rarely given oral sex in the 15 years between my first and most recent time. I have never had these exact symptoms at any other time so I think it is implausible that they are coincidental with not caused by giving oral sex.
A google search came up with nothing, suggesting this is uncommon. Is this a recognised condition, and are there any appropriate precautions or treatment?