What parasite has an exoskeleton that can infect humans?

The parasite known as Acanthamoeba can infect humans and has an exoskeleton-like structure, particularly in its cyst form. This free-living amoeba is commonly found in water and soil, and it can cause serious infections, particularly in the eyes, leading to a condition called Acanthamoeba keratitis. Additionally, Acanthamoeba can infect the central nervous system in immunocompromised individuals. However, it's important to note that typical parasites with true exoskeletons, like arthropods, are not generally classified as parasites infecting humans in the same context.