VisualDx is decision support software designed by clinicians to aid medical professionals in the diagnosis of visually identifiable diseases. Enter your patient's key signs and symptoms (e.g., dyspnea, abdominal pain, widespread papules) to generate a patient-relevant differential diagnosis. VisualDx includes dermatologic diseases in all age groups as well as specific modules for looking up travel-related illnesses, conditions in the immunocompromised, pulmonary infection, and oral-mucosal lesions. It can also search over 800 medications for specific drug reactions. Each diagnosis is accompanied by handbook-length text with information on diagnostic pearls and testing as well as guidelines on therapy.