What Is The Sore On Breast Filled With Blood And Pus?

Hi, may I answer your health queries right now ? Please type your query here...I have this sore on my left breast that is about a quarter size. It has been there for 3 weeks and itches. Today I was screening it and it burst. A lot of blood and puss came out. I have also had headaches and been really tired since I noticed it. Yesterday I had a migraine and ran fever. What is going on?