Re: Purple nipples?
I've heard that they can change colors due to hormonal balance.
So if your periods were irregular, due to fluxuating hormones, or if you were pregnant that may be the cause.
It could also be that alot of blood is being pushed into them, if they were growing or changing.
If its just the color i wouldn't worry too much about it, but if they start to hurt or feel weird, you may want to get them checked by a doctor.