Marq 2 Adventurer Rusting Components?

My Marq 2 Adventurer is titanium, but has a distinct protrusion near the back/stop button next to the screw for the back, and that protrusion is rusting.
I can’t pick it off with my finger nail and am hesitant to try a screw driver to pop it off. Is there any chance this is actually intended to be part of the watch?