Hi, my name is Siobhain, i'm 31 years of age I've had a very large lump under my arm since 4/5 years recently it grew double the size then I pressed around it and foul yellow puss exploded now just raising my arm above my head the foul puss oozes again.... Now there's blood that is oozing out. Although the lump has reduced in size immensely, i still have a hard lump that's painless and doesn't move around.