looks like trichomes, but not zoomed in enough.
do you have wpm on leaves?  it generally shows up there long before it can show up on buds.
if you take a magnifier and see indidivual stalks and heads, those are trichomes.  if you see what looks like a weird mesh-looking covering it, that's mildew.  looks like a net of fuzz over the trichomes. they won't be so easily seen as individual stalks/heads
https://www.dinafem.org/uploads/oido5_blog_full.jpg
it can be even more dense than that, but you can see it'll be incrediby obvious is something is 'coating' the trichomes.
a clear picture with clean triches
https://www.dudegrows.com/wp-content/uploads/2017/01/trichomes5.jpg