I just got the keys to my first home last night. I've been through it 4-5 times total and I have never seen this, until last night.
It looks like mold to me but I haven't ever been in a mold situation. The ceiling is not soft or anything. To give you perspective, this is above the living room door where the ceiling and wall both meet. It is a ranch so there is no upstairs, New roof as of 2 years ago.
Do I automatically go to opening it up, asking why the inspector at least didn't spot it, etc?
Thanks!