Mold found under wall paper

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I've seen mold like that when a humidifier was run heavily for whatever reason. If the wall doesn't feel damp, I'd wash all paste off vigorously, allow to dry thoroughly, sand lightly, apply a quality stain suppressing oil based primer such as Cover Stain, then top coat with a quality acrylic. Keep an eye on it. If you see more mildew the problem is exterior related and will require attention.
 

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