The views expressed by me are for educational purposes only and do not establish a doctor patient relationship.
This is Dr. D.J., experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
It is very unlikely for blood glucose to change so fast.
Boils can be caused by the skin bacteria in normal individuals also.
MRSA is one such bacteria that can be contracted from another person, say for example, in shower, swimming pool etc.
You can use over the counter bacitracin ointment twice daily for 5 days.
However, if no improvement is seen by tomorrow, then you will need prescription antibiotic ointment like Mupirocin.
does not sound like that since you had recent normal blood tests.