Pimples or bumps behind wallpaper
We noticed these hard pimples underneath a window. Did some research and many said it was from water infiltrating and causing the glue to crystallize. We pulled the window and didn't see much evidence...
Forum Discussion
I have a similar situation under the back window in my Leprechaun. I haven't done anything about it but I guess I should, in case it is mold. The bumps are hard and rather pointy so I was think crystals.
