By using health factors and stop codes unique to each app, the investigators will use the VA Corporate Data Warehouse (CDW) to measure the impact of both apps in two separate trials on outcomes reflecting dermatology access. At the end of the study period, the proposed research will result in a novel documentation of mobile teledermatology's effectiveness in enhancing Veteran's access to dermatology service. The results will be of significance to VA as it develops and implements other mobile telehealth programs, and more generally to other healthcare organizations planning for large-scale telehealth interventions.