What Can Be The Reason For Getting Boils Often?

I am 28 years old, 5ft 8" and weigh 62kg. I have had irregular and heavy menstruation since I was 12. To make my bleeding lighter, I was prescribed contraceptives 20 days ago for 3 months. I started using oral contraceptives 20 days ago and stopped after 14 days because it made me feel tired and weak. Now I have had 2 big boils in 10 days. Why am I having boils and what can I do to stop them?