For all skin related problems, this is the site I recommend people to visit first in their internet searches. They have a section of the site dedicated to the public here
http://www.aad.org/public/index.html

One of the best self exams on the internet for melanoma detection as a guide can also be found here and if you are reading this, take a minute to read over this part of the site now and then the next time you look in a mirror do yourself a favor and do a mole check.

http://www.aad.org/public/exams/self.html