Our house is approximately 25 years old. We have owned it for 17 years. We noticed that the ceiling and outside walls were getting dark shadows where the beams were along with some large round dark shadows. Only on the outside walls though. We repainted 2 years ago and it has begun showing again. Would there be a possibility of mold growing in the outside walls of the insulation causing this. I really need an answer to try to solve this problem. Thank you
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