What's this weird yellow spot behind my tonsil?

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I'm prone to a teensy bit of health anxiety. Coming from a family of medics doesn't help! I discovered what i thought was a white spot behind my left tonsil but now appears to be yellow. Its not sore. I wondered about a tonsil stone but its not shifting with a cotton bud. It's been there about three days now. i do smoke (i know, trying to quit!). im 32. Suggestions?!