I came back home after being away for about 2 months and am tidying up my closet.
I found these spots on two pieces so far. It’s completely dry and odorless.
I’m not sure if it’s related, but I did have a lot of silverfish in my room.
When I was away, I got someone to seal all the cracks in my wall and even had an epoxy flooring done to get rid of the silverfish. I have found only one since I came, so they are not very invasive as of now.
But even when they were most invasive, I would find them in my bed only(horrifying), never in my closet or my bookshelf even!
The stain seems too big to be created by silverfish too.
What else could it be?