Horse leech

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a less powerful European leech (Hæmopis vorax), commonly attacking the membrane that lines the inside of the mouth and nostrils of animals that drink at pools where it lives.

See also: Leech

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The horse leech is also quite common in the garden, in damp, marshy areas and can be found under stones and logs.
Centuries later, "blistering" of the scalp with acids, onion and honey massages, ground snail and horse leech potions, vacuum cap suction, electrodes, scalp popping and assorted other tortures.