Logical Images' intelligent VisualDx atlas for the diagnosis of fever, bioterrorism-related rash, and adult rashes stands above all other digital atlases in the field. Its collection of images is of the highest quality, and its search features are novel and effective.
Using VisualDx, one can search for the diagnosis of a rash by appearance, location, and symptoms. Those who are not dermatologists can access dermatological knowledge by fixing on icons denoting, for instance, a flat lesion or purpuric lesion. These icons show what happens when you press on a lesion—a blanchable area gets less red when pressed. Selecting the purpura icon reveals a visual differential diagnosis of thumbnail digital images of purpuric diseases. Images can also be searched for by anatomic distribution (eg, acral). These search features make VisualDx a more useful diagnostic tool, especially for nondermatologists, than the excellent University of Erlangan Dermatology Online Atlas.