Hello I am a 29 year old female who within the past 2 years started developing a lump under my left armpit, probably 3 to 4 times within the past 2 years 1 to 2 weeks before my menstruation. As soon as the lumps developed I would go to urgent care and see a dr. to examine them, they would tell me it was either a cyst or swollen lymph node. Now my main concern is that today I noticed my left breast larger than my right, I feel burning pain and it also feels heavy. When I touch my left breast it feels hard and i might have a lump. I am about to start my period next week or so. I noticed mild breast pain yesterday but didn’t feel my breast heavy, I usually get tender breast before my period so It didn’t concern me that my left breast felt in pain. Until today when it was in more pain, I decided to go to urgent care, and dr told me I have an infection. She told me she was concerned because I’ve never been pregnant and I’m not breastfeeding. She says it concerns her that I developed an infection, she will send me to get a mammogram and an ultrasound. My question is could my armpit lumps that would come and go before my menstruation within these past 2 years be related to this ? I’m so scared this could be cancer. I do exercise regularly and my armpits are always covered up and I sweat. Could this be a cause of the infection?