Need urgent help! Mold?

Help! I’m about a week from harvest, first plant. AnD wHaT Is tHiS!?! I notice this almost white cotton ball like spot forming on the side of my main/apex bud!? Is it mold?! Can I save it? Humidity is always 30-55% MAX and temp 70-82ish. Maybe I don’t have enough air circ? AHH HELP i don’t want to ruin my grow I’ve worked so hard for!

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