Based on the symptoms described, it is possible that John has developed an infection in his foot, which can be a serious concern for individuals with diabetes. The presence of pain, swelling, redness, and blackened tissue around the cut are indicative of a possible infection. Additionally, the low blood pressure of 90/50 may suggest that the infection has spread and is affecting his overall health.
In individuals with diabetes, foot infections can be particularly concerning as they may progress rapidly and have the potential to lead to more severe complications, such as cellulitis or even gangrene.
It is important for John to seek immediate medical attention, as diabetic foot infections require prompt treatment with antibiotics. The healthcare provider will likely assess the severity of the infection and may consider hospitalization, especially given the low blood pressure, to ensure appropriate management and prevent further complications.