I also developed (NurseAssist: https://play.google.com/store/apps/details?id=com.novalead.nurseassist), along with my colleague Kiran Kakulte for tracking Nurse visits for a nurse assisted clinical trial. We also build the infrastructure necessary - using NodeJS/MySQL backend, the same backed is also used for the Woundly app described above.
Side Note on tech stack for above apps:
1. Android Native, OpenCV
2. NodeJS / MySQL
3. AngularJS for Web portal (This cannot be shared because it is not open to public)
PS: On another side note, if you or any one you know is affected by diabetic foot ulcer (DFU) and you live in India, you may register your interest for participating in a currently running clinical trial at: https://goo.gl/forms/Cc2yd4sl8qYwBycq2