Though it was only superficial, the lesion on the three-year old's arm looked sinister. Oddly symmetrical and oval, it looked like a pinkish field of delicate needlepricks on the pudgy arm and elbow, oozing a little and forming a crust the color of lemon yogurt on the edges. The child sniffled as Sandra gently explored his injury. His cheekswere still red from bawling.