question: Hiya my name is Lindsey, I m 21 years old and I m a big gir. I have a sore lump in my arm pit it s been quite painful today it burst and now leaking yellow stuff with blood and it s still a bit sore. What could this be ?? I still have a slightly solid limp under my arms..? Also I haven t had my period in few months then all of a sudden I come on I ve been bleeding for about a month now non stop ? Hope you can help.