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Enlarged left breast in pain

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?  
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Hello and welcome to the forum. Sorry for a delay in response and we thank you for your question.  That you have already spoken to a doctor each time you discovered a lump is great. That is the best way to take care of yourself.  I think the best thing is to see an ob/gyn specialist for your care at this point. Urgent care is excellent for those situations that are acute but ongoing care at a regular doctor helps keep care consistent. Did the urgent care doctor begin antibiotics?   Mastitis is very common.  https://www.mayoclinic.org/diseases-conditions/mastitis/symptoms-causes/syc-20374829 It's more common in breast feeding women but it can occur in anyone, even men.   This is another good article that talks about why someone who isn't pregnant or breast feeding may get mastitis. https://my.clevelandclinic.org/health/diseases/15613-mastitis  Let us know how you are doing.
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Hello I had an u/s done and was informed that I have a cyst 2cm big; per my dr she states it’s benign and could have surgery to remove it if I wish to. I have a referral to see a general surgeon . Why do cysts form ? I have developed lumps under my armpit, before my period in the past. They diminish once my period starts. But this is the first time I have developed a cyst on my breast.
Hello,  I am very happy it is a benign cyst only.  These are very common.  They form for various reasons. They are fluid filled and can be something like an infected sweat gland. Basically, cysts are the result of fluid accumulation in the breasts.  https://www.mayoclinic.org/diseases-conditions/breast-cysts/symptoms-causes/syc-20370284   Cysts are rarely cancerous (malignant) and may be caused by blocked breast glands.  I would not be concerned that you have these as again, they are quite common in your age group. https://www.hopkinsmedicine.org/health/conditions-and-diseases/common-benign-lumps
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Anyone? Sorry my anxiety is really getting the best of me :(
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