At a guess, a screw or rivet popping up in the substrate, now threatening to break thru the roof membrane.
You can wait til they pop and put a dab of lap sealant on them, or be preemptive and make a tiny slit to let it through and then seal. The main concern is why are those whatevers popping up in the first place. Is it maybe a symptom of a deeper problem?
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC