Caillou wakes up not feeling well and so his Mommy suggests he sleep some more. When he wakes up again, he has spots all over him. He has the chicken pox. He doesn't like it at all. His Mommy gives him some baths to help relieve the itching. He's also given red-colored dots to put on Rexy and as his chicken pox clears up, he removes the dots from Rexy. Unfortunately, although he's cured, Rosie now has the chicken pox. Caillou assures her that she'll take lots of baths and her spots will go away, just like the ones that were on his dinosaur.