One problem that every DIYer runs into at some point is torn drywall paper. This happens when something that is attached to the surface is removed and the paper on the face of the drywall is torn to reveal the brown layer underneath. It usually occurs when existing wallpaper is removed or pictures hung with adhesive or tape are removed. When it happens it may seem like a small problem but it can turn into much more if not handled properly.
If all the loose paper is not removed and the brown layer is not sealed it can continue to bubble even after being patched and painted. Everyday latex or oil primers will not seal this in and keep it from coming back in the future. You need to use a primer like Zinsser Gardz Problem Surface Sealer to keep this from happening.