Grab them lightly and give them a twist. Or use a realy sharp pointed object and carefully scrape or pull/pry off the rock etc. you want to try and get them whole. If they do pop, and you have other types of corals etc some if not most of the particles now released from the bubble may be used as food for the other corals. if not hope your skimmer takes some out.
In my first tank a long time ago I would see them and I would just pull them out. Once and awhile I would pop one with no ill affect or major outbreak in the tank. You just have to keep on top of it.
Good luck.
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