Hello. I am 19 years old, 5'5, and 200 pounds. (in case you need to know...) I have a small lump underneath my armpit. When I fist found out about it, it sort of hurt, but now it's just there. I went to see a docter and they said to use a clean razor when shaving and if it doesn't dissapear, to see them again. Just recently though, I pooped blood. (by recent, I mean 2 hours ago...)