I am a 23 year old male and for several years now I've had a painful lump or disc under my left nipple. It is very painful, but only when touch. It hurts to lay down on my chest and hug others or simply bump it. For a while both of my breasts (male breasts that is) were the same size, but my left one (the one with the painful lump) is larger. I also have many visible lumps or bumps under my armpits (sometimes I get one that hurts in the left armpit). I previously had a mammogram done and was told I had some type of fibrocystic mass in the breast. I am also very thin for my age and height (5'10 120lbs). If anyone has any ideas please let me know.