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welcome to just answer
there can be various causes of low body temperature
they include inadequate clothing, exposure to wind, hypothyroid, anemia, liver disease, sepsis etc
in your case since you have a swollen foot, that can be the cause of low body temperature
you foot might be having a focus of infection or chronic inflammation
rarely, if this infection travels the blood stream, the body temperatures can reduce sometimes
In some cases, there is no known cause of low body temperature
if all the possible causes are ruled out, then usually there is no need to worry
i would advise you to consult your doctor for need of antibiotics considering the involvement of the foot.