Hello, I'm 26 and last night after returning from a cottage and swimming in a lake for a few days I noticed what appeared to be a bloody discharge coming from my left nipple, after taking a shower.  It stopped after a while and has not started again, even when I try to see if any more will come out.  Could this simply be the result of wearing a bathing suit for prolonged periods of time and that irritating or cutting the nipple to cause it to bleed?  Does the fact that it only happened once mean anything, or is that still cause for concern?  I've read other postings and wasn't sure if when people talk about nipple discharge, if that is something that continues to happen or if it happening even once means anything.

Thanks!