I've never head of "Schnauzer tail", but "Schnauzer bumps" is common groomer lingo for the little zits this breed aquires when their undercoat hasn't been carded-out out properly. The skin pore becomes clogged and irritated when this excess dead hair isn't removed, and a little sore appears. But that isn't just on their tail, it's all over the place, so it may be something totally different. My Poodle has "stud tail" where he loses the hair at the base of his tail, but from what I understand it's not serious or truly treatable. Nothing like pimples. Sorry, I'm not being very helpful.
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ALL generalizations are bad
Jacob
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