I was told to wrap them in a warm rag and hand express a little ti help relieve pressure
I found out what it Is, its blocked milk ducts. To get them gone you put a warm rag on them.
Skin darkening in pregnancy is normal and hormone related. Darkening of the nipples and formation of the Linea Nigra (Line from your belly button) are expected in pregnancy and help aid your baby in finding your breasts for nourishment...at least that's what mother nature had planned :)
I just started getting the same thing about 2 weeks ago but I've been leaking since 20w & I'm 33w+3d now. Haven't thought much of it since my nipples have gotten darker I thought it was normal that those developed too