I have a painful lump that comes up under my right breast every four weeks or so, about a few days before I should have a period. I have taken antibiotics for it, and also used warm compresses. It never comes to a head and drains. A mammogram showed no mass or anything. I have just turned 44 years old. My doctor thinks it could be a cyst or a boil. It comes up about every 4 weeks, is painful for a few days, then swelling and pain goes away until another 4 weeks or so, and it comes up again. Hurts to wear a bra, and also to go without a bra. My doctor said it could possible be an encapsulated cyst. I would just like to have more information on what the problem could be and what can be done. I am tired of this every month or so. If anyone can help, I would really appreciate it. Thanks!