Ear Seeker CR 5
Ear seekers are tiny, pale-colored worms that dwell in rotting wood or other organic detritus. They can be noticed with a DC 15 Perception check. Otherwise, a living creature poking about their lair inadvertently transfers one or more ear seekers to its body. The seekers then search out a warm location on the creature, especially favoring the ear canal. Once there, they lay 2d8 eggs before dying. The eggs hatch 4d6 hours later and the larvae devour the surrounding flesh. Upon the death of their host, the new ear seekers crawl out and seek a new host. Remove disease kills any ear seekers or unhatched eggs in or on a host. Some ear seekers favor living in intact wood, often hiding in dungeon doors. The small pinholes left by this variety are particularly hard to spot (Perception DC 20).
Infestations: Parasites such as ear seekers or rot grubs cause infestations, a type of affliction similar to diseases. Infestations can only be cured through specific means; no matter how many saving throws are made, the infestation continues to afflict the target. While a remove disease spell (or similar effect) instantly halts an infestation, immunity to disease offers no protection, as the infestation itself is caused by parasites.