## 4 Discussion  
A set of systems was presented that is intended to help in the follow-up and study of the diabetic foot. Comparisons were made of the measurement differences for each physical principle between the results of healthy people and people diagnosed with diabetic foot. Figure 11: (**a**) Screen of the virtual platform to create a new account and log in; (**b**) screen for locating patients’ ulcers by recording their coordinates and their characteristics. Figure 12: (**a**) Image of the portable diabetic foot information hub system; (**b**) screenshot of the interface for system control, acquisition of measurements, creation of the file, access to database, etc. Differences were found in the measurements of punctual temperature, electrical impedance and infrared thermography. From the results of the punctual temperature presented in this work, we can say that there are differences between the temperatures of diabetic patients and healthy subjects: the temperature in diabetic patients is higher, coinciding with what the authors of these works say [4; 16; 28]; in addition, they state that this temperature increase is an indicator of foot lesions. The punctual temperature system was tested with a very small sample; a larger sample is required to increase the reliability of our results. With impedance results, we cannot conclude that any structural damage is present in the feet of patients with diabetes, but we can say that the electrical impedances of diabetics and healthy subjects are significantly different for frequencies from 5 kHz to 22 kHz and the impedances in diabetic patients are higher than in healthy subjects. The study of this work agrees with our results by finding the frequency range from 10 kHz to 80 kHz where the impedance is different in diabetic patients [9]. The author agrees that impedances in healthy subjects are lower than those in diabetic patients [8]. The results shown in Figure 7b are new to the research; since the behavior of the measured voltage between the injected voltage in diabetic foot has not been studied, we found that there are significant results of \(p<0.0001\) for most frequencies. An algorithm for image processing of skin macules is proposed with a classification network, resulting in an accuracy of 97.5% for the four types of macules studied in this work. Vascular, petechiae, trophic changes and traumacutaneous manifestations are not taken into account in diabetic patients; however, [PERSON] et al., says that they can be some of the first indicators of diabetes and diabetic foot in patients [10], and other authors says that 60% of diabetic patients suffer from this affectation [29]. The infrared temperature measurement system provides images that identify the characteristics of diabetic foot complications; the results of this work indicate that there is an average difference of 1 to 2 \({}^{\circ}\)C in the temperature of healthy tissue with respect to the diabetic foot, and given the study of [PERSON] et al., we could say that there is a relationship between the areas with greater temperature changes and the risk of ulceration in diabetic patients [3]. The smartphone-based diabetic foot sole risk zone identifier system in uncontrolled environments can detect risk zones for ulcers and necrosis by analyzing temperature increases and decreases in uncontrolled environments, with an accuracy of 90.09%. A system for remote monitoring of diabetic patients' feet has been developed with the purpose of being implemented as an assistance and follow-up tool for them. Evidence of the use of a smartphone to follow the evolution of temperature changes in the plantar region was presented, and results of the use of an IR thermometry system in the medical consultation of diabetic patients are shown. A platform for diabetic patients capable of recording the patient's history with graphic material is presented and, finally, the concept of an information concentrator system capable of distributing the information to specialized medical personnel is described.