I have been working on this particular cake for a few days now, and finished it last night.  I was extremely happy with it, sent a picture of it to the anxious mother who loved it, covered it last night, and relaxed.  About two hours later I went to look at it again, and there was a giant air bubble forming on the side!  Between the fondant and frosting, like a giant air pimple.  lol  I popped it by poking a small hole and slowing pressing the air out. A few hours later...back again!  So I did the same thing, then poked a tiny hole under one of the decorations and piped a tiny bit of frosting in, thinking maybe the fondant just wasn't sticking to the frosting for some reason.  A few hours later..there it was again!

I went to bed (had dreams all night of waking up to finding cake bits blown all over my kitchen, eesh) and there it was again!  I have to deliver this cake in two hours, and now the fondant is even getting soft and puckered in that place.  I may just cry.  Please, does anyone have any ideas on how to make this go away!  It just needs to make it 3 more hours!  Thank you!!

(btw, it's a three layer devil's food cake, fully cooled before iced, then crumb coated and stuck in the fridge overnight before adding final layer of frosting and fondant)

AI've heard that sometimes if a little corn starch is trapped in the it will chemically react and create an air bubble... Not sure why it's recurring tho! Anything you could stick in front of it? A flower or something? Maybe squirting some lemon extract in there would melt it just enough to adhere....hope you get it fixed!

AGet the smallest straw you can find like a coffee stirer. Poke it into the bubble and suck out the sir. Your lips never touch the cake. Put a deco over the hole from the straw.

ATheCakeDude...I've never heard of the corn starch thing! That's really interesting! Hmmm...

Leah_s...I've.pushed the air out a few times, it just keeps coming back!

Well, I pushed the air out and left it uncovered it until I delivered it, it wasn't until I had to cover it to transport it that it came back! SO odd. I deflated it again and just left it uncovered...at least it made it! :)

AWhen it happens next time, and it will, don't PUSH the air out, suck it out with a straw like I wrote. Also works with bubbles underline buttercream.

What Leah said.  Works every time and the bubble never comes back. 

AI use a stir stick to poke a hole in the icing or fondant, and press the air out, when it happens, but prevention helps too! I cut my stir sticks into 1" pieces and stick them in the edge of the cake, next to the board, as close as I can get. The excess air escapes through there. I have never sucked it out, gotta try that, if I forget to put the sticks in sometime....

Leah_S...I see what you're saying now!  I'll definitely try that next time!  Thank you!