In To Kill a Mockingbird, what did Burris Ewell have in his hair?

At school, Burris Ewell has cooties (head lice) crawling through his hair.  Burris will not appear throughout the school year, but he does make an appearance at the start of each new school year, in compliance with the truancy officer.

 Burris's appearance, as well as his foul mouth, confound Miss Caroline Fisher, his new teacher.  Scout attempts to acclimate Miss Caroline to her new teaching environment by giving her the lowdown on the Ewell clan,...

At school, Burris Ewell has cooties (head lice) crawling through his hair.  Burris will not appear throughout the school year, but he does make an appearance at the start of each new school year, in compliance with the truancy officer.

 Burris's appearance, as well as his foul mouth, confound Miss Caroline Fisher, his new teacher.  Scout attempts to acclimate Miss Caroline to her new teaching environment by giving her the lowdown on the Ewell clan, as well as on some of the other families represented within the school.  In her explanation of the families, we get an early introduction to the Ewells as well.  Burris's father, Bob, and his sister, Mayella, factor heavily into the later action of the book, so the early introduction proves helpful.