How about "Everything You Always Wanted to Know about Puberty." Sound helpful?
http://kidshealth.org/teen/sexual_health/changing_body/puberty.html

Read "Questions and Answers About Acne," from the experts at the National Institutes of Health.
http://www.niams.nih.gov/hi/topics/acne/acne.htm

Info about girls' growing bodies from "4Girls Health" at the National Women's Health Information Center
http://www.4girls.gov/body/index.htm

A doctors' perspective: Puberty information for boys and girls from the American Academy of Pediatrics
http://www.aap.org/family/puberty.htm