What is the relationship between diabetes and coagulation?
Bacteria infect wound and blood can't coagulate.
A diabetic person has a fluctuations in blood sugar that can become really high or extremely low. When this person is injured, due to high blood sugar, bacteria grow and infect the wound.
This means that the blood cannot coagulate as the bacteria must be destroyed first. If the wound is left untreated, the abscess can become extremely large, which can lead to amputations.