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Hi my name is Robert.....
DO you have felt on the ceiling or is it wood? Or something else?
OK... Sounds like felt, it would be really thin, what I would do is get a razor knive and cut a small section so you can peel that down and see what it look like from underneath, if the wood underneath the ceiling material is rotted I would spray glue a section back in and then clean the ceiling material with some bleach and see if you can get that spot out, if the wood under the ceiling material is NOT rotted but the wood is stained then I would use some kilz on it.
IF the area is hidden and is not going to be seen then I might just cut the ceiling material out and leave it as it is not seen.
Normally if you have black spots, it can be caused by heat or if you had a leak, so I would do a visual inspection outside above that area and make sure everything is sealed up good.... Hope this helps, IF you have more questions or concerns please feel free to contact me. IF you are satisfied with my efforts please feel free to select a rating, it is the only way I get credit for helping this holiday weekend... Robert
HI..... Was just checking in to see if my answer helped???? IF you have more questions or concerns please feel free to contact me....
Have a Safe and Happy 4th!!