Textbook of Dermatology
An extensive online textbook on Dermatology edited by Rhett Drugge and Heather A Dunn. The contents of this online textbook starts from very descriptive anatomy of the skin and then proceed to more advanced topics. This book also include environmental dermatology topics like radiation effects, sun damage, occupational dermatitis etc.
Terminology in dermatology was always a confusing thing to remember. Here is a list from the textbook comprising most commonly used lesion descriptions in dermatology. This site also contain lot of images of dermatological conditions so that learning curve is shortened. The electronic textbook of dermatology is fully searchable which will ease the finding of required information.
Note: this site uses frames in the designing so you won't be able to go to the home page from the lesion descriptions so use this link to access all the contents.