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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
MattG87
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.