The goal of this clinical investigation is to evaluate clinical efficacy of medical device Berovenal® intended to promote treatment and to expedite healing of chronic diabetic foot ulcer in male or female subjects aged 18-85 years with diabetes mellitus (type 1 or 2) and with present diabetic foot ulcer by providing moist environment similar to intracellular environment of the damaged tissue. It will also learn about the safety of medical device Berovenal®. The main questions it aims to answer are: * Does medical device Berovenal® lower the size of diabetic foot ulcer? * What medical problems do participants have when using medical device Berovenal®? Researchers will compare medical device Berovenal® to a reference device (device with similar purpose of use). Participants will: * Use medical device Berovenal® or a reference device every day for 8 weeks or to the time point when the diabetic foot is closed * Visit the clinic once every 2 weeks for checkups and tests * Keep a diary of their symptoms and the number of times they use medical device Berovenal® or a reference device
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Evaluation of clinical efficacy based on comparison of the percentage reduction in Index ulcer area.
Timeframe: 8 weeks