My blueberry has some spots, but only on one branch of many. Fungus possibly? I know someone out there knows. 
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The margins are very clean, maybe from liquid drops?
Cheers
G
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You didn’t drip any liquid on it, by chance?
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I thought as much, but wasn’t positive. I was fighting thrips for a few weeks right after they went to flower. Potential for droplets is 100%.
It’s the closest branch to the light, so makes perfect sense. Thanks for clearing that up for me!
Love this place!
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The edges definitely seem to clean to be fungal. I’d say it’s bleaching from a liquid dripping on it if I had to guess as well 
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Agree with @Gpaw
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