What is this on my Molly?

Hi guys, long time reader but I just joined bc I’m at a loss.
I’ve got balloon belly Mollies and have a separate tank for my babies. We currently don’t have any males so the baby population is at four.
One of my babies developed this spot on her side and it looks like it’s secreting some sort of something. She doesn’t act like it bothers her, she’s still eating normal and will let me put my finger up to her and knock it off.
The spot hasn’t grown but is darker in color.
I’m afraid she’s gotten hurt and it’s her intestines but also looked up fluke disease. It doesn’t look the same as photos for that though.
Any ideas what it could be and how to help her?

Hi and welcome to the forum

can you post a bigger picture of the fish?

I cropped it closer and uploaded the actual size. Hopefully that helps. She doesn’t sit still long enough to get many pictures.

So as of this morning whatever it is stopped coming out of baby fish. And the dark spot has lightened.
i still would like to learn what it is/was, but she seems to be improving.