Dog Skin Tags My 12 Y.o. Dog Has Skin Tags That Look Like Tick Craters Except I've Never Seen One Tick. What Can This Be?

My 12 y.o. dog has skin tags that look like tick craters except I've never seen one tick. What can this be? - dog skin tags

Sometimes I see what is probably the remains of a crust or flea dirt in the crater. "