Chigger

Dr. Lareau, an emergency medicine physician at Carilion Franklin Memorial Hospital in Virginia, had seen these marks once or twice before on patients. She knew what had caused them. They were from chiggers, a species of tiny, reddish-brown mites able to leave bites that remain itchy for days or weeks.

Source: wiktionary

—He's not black, Stacia Jacobs who smelled like pee said. — He's yellow and black. He's a chigger. Do you know what a chigger is? It's a chink and a nigger.

Source: wiktionary