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MattG87
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That's the after effect of damp, as long as the initial cause is cured I would try Toupret Fine Surface Filler. I think it comes in a tube or pot ready mixed.
Very light sanding to key the surface, sanding sponge probably the easiest. Use a spatula a fair bit wider than the problem and overfill a little bit for shrinkage. When it dries off feather the filler with a wet sponge and paint with Gardz.
The interior filler will also do it.
Airhead
If you use Toupret interior filler mixed with warm water it will dry in a few hours on the sort of depth you need there. You should sand what you have there now back first though.
Use Zinsser Gardz on top of the fresh filler if you don't want it 'grinning' through the new paint.
I only avoid Easifill because it's quite soft when dry and doesn't seem to sand as well.