Acne, clinically known as acne vulgaris, is the most common skin disease. It affects 85% of teenagers, some as young as 12, and often continues into adulthood. It is also called "pimples," "zits" or "blemishes."
I provided a set of 6 illustrations depicting the anatomy of the skin and different types of acne relative to what we normally see (see photographs) for an AboutKidsHealth article on acne.
The Hospital for Sick Children (SickKids)
Adobe Illustrator and Flash