Crossword Genius

Parasites by follicles (4)

Ross

I believe the answer is:

lice

(Other definitions for lice that I've seen before include "Parasitic insects" , "Bloodsucking insects" , "Crawlers" , "Wingless bloodsucking parasites" , "Bloodsucking parasitic insect" .)

I've seen this clue in The Washington Post.
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