I noticed it there about 2-3 weeks ago, it's a bit sore & it's still there, & I'm 23 had 2 aunties had breast cancer and later passed away
Amy, your armpit is filled with lymph nodes. Sometimes one can become swollen as your body fights an infection. Sometimes a swollen lymph node can be a sign of cancer. Not every lump in the armpit is a lymph node. Sometimes a harmless cyst can develop there. It's a good idea to check with the doctor about any breast or armpit changes that last longer than a month. I wouldn't say that this is a problem to worry about because probably the cause is benign. It is a sign that needs to be checked out. Read this article about armpit lumps for more background information.