Sadly it's best to remove them asap! Be careful when doing so do not squeeze them if possible to help stop the spread of the mold. Carefully remove and discard all buds with bud rot, as well as nearby buds – this is incredibly important if you don’t want to lose the whole harvest! Don’t let anything any of the rot touch other parts of your plant, as it can further spread mold spores. A tip a friend gave me is cover the bud with a plastic bag then snip it off so you don't spread anything around. Sorry to hear about your issue! Happy Growing.