Looks like mites, or spiders, or something... poke the thing, pull it off... get down in there...
Could be mold. Ventilation (over low humidity) is definitely the key to avoiding/beating mod/mildew/rot. And lack there of to getting it. But even at my high humidity/low ventilation I didn't get mold (I got some on my soil, not on my plant) but I got bud rot in a couple spots that were touching a wall.
Definitely get a fan in there asap.
Also maybe remove that bit o bud (thoughts on that? If it's mold or mites it could spread is what I'm thinking)
If it's all over... then it's a toss... I've smoked some buds like that... tasted crap, weren't very potent, and I know it wasn't healthy... inhaling mold never is, I was just an ass.