Discussion 
One of the most important complications of Diabetic Mellitus (DM) is Diabetic Foot Ulcer (DFU). A significant number of the patients diagnosed with Diabetic Mellitus would experience DFU (1).
Necrotic Fasciitis that can be developed in a DFU is a rare but dangerous infectious disease of soft tissue (2).
Leech therapy as a treatment method for Diabetic Foot Ulcer may have complications, such as Bleeding; which can be controlled by topical thrombin and pressure; if not, blood transfusion can be helpful, Allergic responses and scarring. Aeromonas hydrophilia,  a Gram-negative bacterium in a leech’s digestive system can lead to abscesses, cellulitis, and sepsis if it’s not developed in a standard criteria (3).