hi i am 28 old female. I had noticed for some years now that when my periods are nearing a lump like thing appears in both my armpits and it was painful. Lump as in it appeared as if a little section of my armpit was swollen and sort of hanging and this swollen bit was painful. However as I got my period the pain faded and the swell went off and my armpit were back to normal. However since of late even though the pain disappears after my periods, the lump doesn't go off. It is just there and I am worried. I have not been using any underarm deodorants. Could this be a cancer?