What does miss Carolina find in Burris ewell's hair?

• She's called back to the here and now by a shriek from Miss Caroline, who's seen a "cootie" (3.37)—probably a louse, which may sound more familiar in the plural, lice—on one of the students.
• Miss Caroline tries to send the student, named Burris Ewell, home to wash his hair (after looking up lice remedies in a reference book), and says he should take a bath (which he apparently really needs, since he looks worse than Pigpen from Peanuts) before coming back to class.

Miss Caroline finds lice in Burris' hair.