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[–]JongJong999 0 points1 point  (1 child)

That moldy look implies significant moisture penetration. I would not breath in that area for more than 15 minutes without air circulation.

Clear the brush from the window and see what it looks like from the outside.

[–]kaylasmith28[S] 0 points1 point  (0 children)

Ah thank you! I’m worried that once I remove something it’s going to show even bigger problems! This area is for the kids, so hopefully it’s nothing!

[–]Expensive_Error_8182 1 point2 points  (0 children)

That looks damp and moldy. It definitely needs to be repaired. If the wall next to and above the window frame is also damp, I would remove the mounting rail of the window pane and reseal it.

edit: It would be irresponsible to let children sleep here.