I fixed mine by mixing plaster with the ceiling paint to make a not too thick paste and then brushed it on with an artists brush. If the ceiling is relatively new it blends in very well if it's an older house you will see the difference in the paint color. It will come back again as they tend to close up in the heat of summer and then open back up again in the colder months. I now just live with it, it's not really that noticeable.
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