AsNoriuanswered grow question 3 years ago It's bud rot. Take plastic bag, put it on hand, grab slowly that bud and cut 2-3 nods down. That way your rot will be easy placed in bag and taken away. Something like dog walkers do every day. It multiply with pores, they are light and transfer through air, so it's very important to not spread it.
Better plan harvest asap
Google lemon soda peroxide bath, bud wash before harvest . You can find loads of video on YouTube too. Some are crap tho.
Good luck in saving !