I've seen "warty" bumps on V's before, but those are usually like benign growths, not an infection, and lots of them don't appear at once. I suspect Rosie's crusties may be different from what Ziva has, because Rosie just gets like one or two at a time. I wondered if Rosie had some type of mites. I gather puppies often have a type of mites that don't cause any real problems and are different from the kind that cause adult "mange," the kind puppies commonly have, they can only get from their moms and they grow out of them with maturation (I can't remember what age).