text: help! whats this wierd lump on my chest? hellp! i have always had this birth mark on my chest that looks like a pin prick. just under my neck and above my chest. until recently it just was there but now has started to smell and is very painful to touch. it smells like body odour which is totally out of the ordinary for me!! when i push it clear stuff comes out of it and it smells awful. could it be a blocked sweat gland? or what?? i really really would appreciate an answer from anyone who can help, as even though im a bit worried i feel its a bit trivial for the doctors! sounds like your typical sebacious cyst.  you can have one of these for a long time and have it not flare-up.  and then all of a sudden, it's swollen, red and oozing stinky, smelly fluid.  it's an encapsulated type of growth, so it will need to be excised in its entirety, not simpy drained.  or it will return at a later date.  the surgeon i work for would most likely put you on antibiotics to calm down the immediate infection and then have you come back to have it excised at a later date while it's much more calmed down.  simple, in-office procedure...10 minutes tops!!!