seems to have resulted in development of folliculitis
Since this is an infection you need to two things.
1.. Proper course of anti biotics and best would be get the culture and sensitivity of pus done and then take anti biotics acvordingly.
2.. Without the control of your sugar levels,it would become difficult to eradicate the infection.
You must consult your doctor and get the dose of anti diabetic medicines revised and get the prescription of anti biotic medicine after the pus culture and sensitivity report.