The following are textbooks of possible interest and are available either in print or online.
To find more books of interest, use the Roger search box below.
Color Atlas of Dermatology by 
Clinical Dermatology by 
Patterson's allergic diseases by 
Harper's Textbook of Pediatric Dermatology by Resources for this Case
Textbooks (look left)
Finding the background "What, How, Why" Resources
Clinical Tools -- Medscape & Up to Date
A Reminder about DDX tools
Google Tips - Make Google work harder for you
Don't forget that some of the basic questions can best be answered by some of the textbook resources. Since you may not always know what is the best one to use, the collection of textbooks in Access Medicine offer a quick way to find resources.
In this case, things like; what is APGAR? how is it used? what is Stevens-Johnson? why does it occur? Or, what to do when medication errors occur. So many questions but also so many answers.
Don't forget the drug databases (especially Micromedex) as a resource to understand more about Stevens-Johnson.
These resources may also provide answers for some of those What, How, & Why questions. A few tools do a great deal of the work for you to gather information and re-package it into a nice synthesized statement on a disease or condition. However, they all have some work to do as not all topics are as fully covered as they could be. One of our derm specialists recommends Medscape.
DX Resources
Perhaps your questions this week deal with understanding the different symptoms the patient mentioned. What do they indicate? Without some good hunches it is hard to move forward. There are a number of differential diagnositc tools to help with the process.
Books:
Differential Diagnosis and Treatment in Primary Care (WB 141.5 C712d 2018) The book lists alphabetically a variety of symptoms. Each category provides a section on the "approach to diagnosis" and other userful tests to consider. Some sections have short case presentations to test your skills.
Differential Diagnosis in Primary Care (WB 39 R231d 2009) Similar looking name but organized differently. This book presents information organized by areas of the body. 
Differential Diagnosis of Common Complaints (WB 141.5 S467d) The book is organized around common presenting complaints. Sections also include details on associated symptoms, physical findings, diagnostic studies, and presents a summary of these in a handy table format. Check out their chapter on Skin Problems. Online Tools: Usually just a list, some have brief descriptions
A small section of a well-regarded clinical tool but this symptom checker is free to use - no subscription required. Once you register, enter symptoms and it will help you use some standardized terms.
Making Google Work Harder for You
I know sometimes that Google is the favorite place to search simply because it works so well. But how can you make the best stuff jump to the top of the list? There are some tricks you can use - in this case, a domain search.
Think about who might be the best provider of the information needed. Would that be an university? Would it be a government agency? Might it be a national organization? My go-to technique often is government because it includes all that stuff in PubMed & full-text articles in PMC.
So maybe to a search on severe cutaneous drug reactions add site:gov .
You can always revise the search qualifier to a org or edu if needed, but see what you can find with this start - knowing that you are using typically authoritative resources and not just Wikipedia.
Genetics Resources
These two resources are available to everyone without a subscription and for the most part have been developed with government funding. One is more health professional focused and the other has more patient or consumer focused information. These tools will be available to you even when you graduate and move on from UCSD.
