Can I cut out a blister in my drywall joint and add more tape to the small section?
I like to get some mud under the tape, if not painted just cut it lay it back add mudd and put it in place and work it flat.
If painted I use a big syringe and push some mud in there work it around and press the air out Ends up looking like a small nail hole but works really well when going in on a poorly done job that you don’t want to spend a lot fixing up.