Ingrown hair on breasts, infection or cancer?

i had a small bump under the skin of my left breast for several weeks now. It never looked red or came to a head on the surface of the skin. I noticed there was a black dot so I got twizzers and pulled out a hair and a good amount of formed puss came out. Than the next day the lump was there again so when I squeezed it more puss came out. It's been a few days later from that and no more puss there but there is a lump that has grown under the skin and on the surface a size of a dime that area is a dark purple and around it is a huge reddish pink ring. My boob is slightly swollen and hurts when I touch it. The lump under my breast concerns me that it's getting bigger. Could this be cancer or just a infected ingrown hair?