The Bad Case of The Stripes by David Shannon

Camilla Cream secretly loves lima beans but refuses to eat them because her friends scoff. As pressure to fit in builds, she wakes up covered in bold, shifting stripes—and her skin morphs based on what others say. Diagnosed by an array of oddball specialists and morphing into everything from checkerboards to pills, Camilla spirals until an old woman appears with one simple cure: lima beans. Finally embracing her true tastes, Camilla returns to normal—and embraces being herself, stripes no more.