Billy , you don ’ t look too well . Maybe you should take the day off school .   But Mom ! Today we ’ re playing football ! I love football !   You ’ Ve god a fever and playing football isn ’ t a good idea for a boy with a fever . What ’ s that on your arm ?   I don ’ t know . It was there when I woke up this morning .   It ’ s a rash . I ’ d better take you to see the doctor . How did you get that bruise on your leg ?   I bashed it against the chair in my room .   Does it hurt ? 