Click on the link below to access the new FDA "Tanning Information" section on their website. It should have been titled "FDA Anti-Tanning Information" because (as you will learn) that's what it is.
If this wasn't written by dermatologists, I'll eat my hat! There is nothing about positive (it includes the "a tan is a sign of skin damage" lie.
http://www.fda.gov/cdrh/tanning/index.html