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Is this a commercial canvas? If so, then that is the problem. Many of the commercially produced canvases have a very light coating of gesso on them (not high quality gesso either) and you end up with pin holes. If you cannot stretch your own, then I recommend applying two coats of good professional gesso over any commercial canvases you buy.
Another question is, do the pin holes match the stains? If so, then the rot is already in progress.
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