Pus on tonsil pocket days after oral sex. Could this be an STD?

I noticed one of my tonsil pockets filled with white pus, red and swollen; 3 days after performing oral sex to my boyfriend. Could this be an STD? I also have a mild sore throat but that’s about it. As if right now, almost a week after the sexual act the swelling and redness seems to be improving, yet I still see... show more I noticed one of my tonsil pockets filled with white pus, red and swollen; 3 days after performing oral sex to my boyfriend. Could this be an STD? I also have a mild sore throat but that’s about it. As if right now, almost a week after the sexual act the swelling and redness seems to be improving, yet I still see pus on my tonsil pocket.
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