Face-mapping
I found this chart very interesting and felt inclined to share. Though it's not the be-all end-all for skin problems (my cheek breakouts undoubtedly come from resting on my hand), it's still quite fun to contemplate. Besides face-mapping pertaining to specific parts of the body, I have also heard of categorizing skin types by the elements and by spiritual creatures, and determining ones personality and success in life based on physical characteristics.
Face-mapping
Natural Beauties