Why does one armpit smell like this?

Alright, this girl I was seeing won't tell me what condition she had. She went to the doctor and talked to him/ her about her problem. Her genital region and armpits would smell like fish and itch. She would also notice she perspires more than usual. I did some research and I'm thinking she had bacterial vaginosis. One of my armpits is itching and smells foreign to me but similar to what she had. I'm seeing a dermatologists in a few weeks and will discuss this with him. Any clues or remedies I'm trying not to itch. I notice deoderent sprays kill the itch but gels and bars do not. Thanks