Oh I feel your pain right now!! :o(
I find the bulge happens if my buttercream isn’t thick enough or if the cakes aren’t stacked properly causing unnecessary weight on the layers – plus weather (humidity) can be a factor. I’ve never been able to correct it after it happens. I’d been interested in hearing what others have to say too! Good luck!
Loren
Loren, http://www.thebakingsheet.blogspot.com, https://www.facebook.com/pages/The-Baking-Sheet/210664827961
