It could be nail pops or water damage, both already mentioned. You could fix them but they could reappear without fixing the problem, as mentioned. This on nail pops; http://www.paintsource.net/pages/sol...ood_shrink.htm
It sounds more like water damage (because of bubbles), repair was already posted. Check in attic over spots for missing vapor barrier plastic sheeting or paper-faced fiberglass batts. Check for condensation water dripping from uninsulated bath fans/hood fan. Check for frost on exposed roofing nails dripping and wetting drywall ceiling, a stretch.....Since it's not the roof leaking, it must be another water source, a picture in attic would help......
We have an excellent "Painting" section for a new post about that repaint.....
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!