Help

Hello people recently skimmed a sitting room celing and it has weird marks all over it was not artex celing got seal with 2 coats pva and skimmed in nicely you can not feel the marks but they look terrible there going to paint it and see if it covers any help would be great don't no what it is at all thanks guys
 

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The oblong mark looks to me like a repair to the plasterboard. The brown spots that are bleeding through I think that they are Rats piss stains.
 
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