Hello, I am a 22 year old male, and about four days ago I noticed that my left breast was sensitive and hurt if pressed. Over the past few days, the nipple area became more red and slightly puffier and tighter (although I don't think I would call it a "lump") than usual, and the redness spread to about an inch beyond my nipple. If my nipple area is pressed in certain spots it really hurts, and there is a subtle, barely noticeable dull pain all the time in my left breast.
I went to my university's health clinic this morning, and a physician's assistant told me that the breast was probably infected and gave me a 30 day supply of antibiotics. How it could have become infected, I have no idea; I have no piercings or anything.
Anyway, before I went to the doctor, I read around online about this sort of pain, and read about different illnesses, but I didn't come across anything about infections. Is this a common prognosis? Should I get a second opinion? (I would really rather NOT get a second opinion because of $$$ issues, but I will if necessary.
Thanks for any help!