Most are familiar with the basic biology of skin, and the levels of melanin production affecting human diversity. Jablonski also discusses, however, such topics as sweat and the adaptation of human hairlessness. There is anatomy, physiology, biochemistry, and anthropology exemplified in this book. Not only does she go over (in detail, mind you) the technical ins and outs of skin, but also the sociocultural aspects, such as body modification - decoration through painting, piercing, scarring, tattooing...she touches also on new developments in the research of producing artificial skin.
Obviously, if you are not at all a nonfiction kind of person, you likely wouldn't enjoy this book as leisure reading. But if you hesitate to pick this up because you think it might be a little over your head, I strongly suggest you give it a chance. Jablonski may be writing science, but she writes in such a way that is very accessible (without dumbing anything down). And for those of you who aren't formal students of this kind of subject, you don't need to worry about coming across words you aren't familiar with - while Jablonski does use scientific language, there is a glossary in the back of the book. It's got some nice photos and diagrams, as well.
Definitely an interesting read.