m0useanswered grow question a month ago Looks a bit like a pest. but in other shots looks like WPM. Your not spraying anything in bloom I hope as that could also be a thing.
More pictures would be good, some macro shots. not only from the canopy but also just below it. Looks to be mostly on the top colas.
try and get pics of the underside of the leaves as well.
Need more information before know what it might be. to many maybes atm.