Skin Infections
MDCalc LRINEC Score (online calculator) – MDCalc provides a handy calculator to determine the risk for necrotizing fasciitis at time of cellulitis exam using laboratory values.

Reference Bookshelf
Atlas
Global Skin Atlas – An international effort to catalog a variety of presentations of dermatological diseases in people of a wide variety of skin colors and backgrounds. You can quiz yourself using photos or look up examples of conditions by appearance or by specific diagnosis.
Tutorials
GenoMEL Dermoscopy Tutorial – Tutorial on use of dermoscopy to identify melanomas, complete with sample photos and videos.
University of Wisconsin Primary Care Dermatology Modules – Review nomenclature for primary and secondary skin lesions, as well as patterns and distribution. Then quiz yourself!
University of Wisconsin Primary Care Dermatology Reference Sheet – Text-only reference page for dermatology nomenclature
Medscape Slideshow: Can’t-Miss Common-to-Rare Skin Conditions in Infancy (web site w/images)
Cosmetic Product Safety
EWG’s Skin Deep (web site) – The Environmental Working Group’s cosmetic safety database identifies specific ingredients in various cosmetic products which may be associated with health risks

Reference Apps
AAFP Photo Quiz App (web site) – The AAFP offers this helpful app to facilitate review of dermatologic signs. Currently available on iPad/iPhone and coming soon to GooglePlay.