IS THIS MOLD!?

Alexis • Mama to a little boy & baby girl ❤️

My son just had my makeup brush in his mouth & I just saw this!?!? I don’t remember it being there but it was dry (obviously) and now it’s wet & this looks like mold????

What do I do!? Is my son going to get sick!?

He chews on this brush all the time (I don’t use it) so I feel like it’s mold from the moisture??

Will he be okay?