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Definately the genital massages to relieve 'hysteria' in women.

So blatantly wrong and sexist but with, aha, such a happy ending.

To be fair on the Leeches, the original use in ancient medicine was for malaria and high fever infections. Leeches or bleeding applied in the first 24 hours really can slow the reproduction of the parasite or pathogen depending, so ancient world Mediterranean physicians suggesting this weren't as confused as they looked much later on.

The problem was that during the Middle ages, people took the remedy and applied to to everything, often in northern countries without Malaria. The use of bleeding outside of a relatively small collection of parasites and pathogens and beyond the first 24 hours undermines the system and the ability to fight back. unfortunately, even the classical period physicians had know way of knowing what made the treatment work for some ailments and not for others, and it wasn't until my lifetime that anyone sorted out what the deal was with the leeches.

This is another one that actually started out more sensible than it looked. Trepanation (cutting a hole in the skull) does save lives when head trauma causes swelling of the brain. The risk is of infection is an obvious danger along with bleeding. Trepanation survivors can be found amoung Egyptian mummies and people surviving the procedure can be found in a wide variety of civilizations. Of course, the failures get dug up now and then two. It is hard to tell after the fact whether the head injury or complications killed them.