In order to test the sensitivity and feasibility of field of use of the TBDP app, a second convenience sample of patients will be recruited. Recruitment will be done in waiting rooms with the attending physician's consent. If needed, recruitment will be done outside of the waiting room in the form of flyers, website and e-mail announcements. This population will consist of patients with known high risk to have new/changing lesions, and who fall within the Fitzpatrick skin types I-IV. High risk patients include, but are not limited to, those with dysplastic nevus syndrome, previous history of melanoma/non-melanoma skin cancer, fair skin, >16 nevi, family history of melanoma, and/or immunosuppressed status. The first photography session will be taken by the research team in all 13 projections. Each projection corresponds to each body area that will be photographed to ensure total body photography. After the first visit, the patient will be instructed to take photographs every month for 12 months using the TBDP app on their smart phone or tablet, and have follow-up research appointments every 6 months. The patient will be provided a user guide with written instructions for application use. The TBDP app has a built-in reminder system for the patient. Any changes detected by the app will be stored on the research team's database. Standard of care will be followed for any new/changing lesions. Patients will be recommended to have a follow-up appointment with their dermatologist, within 2 weeks. No procedures will be completed by the research team, and a physician will not be seeing the patients during their research appointments. During these visits, the research team will compare the photographs taken by the TBDP app to the patient's skin to see how sensitive the app is. Patients will continue their regular office visits at 6 months and/or 12 months as per standard of care for high risk patients. The research team will use information from chart reviews for assessment of the outcome for new or changing lesions.