Hi there,
I'm 23, and last night was woken by an extremely painful nipple. There is no physical reason for this pain, but this morning I have notices a swelling and lump that has come up - around the size of a 5p piece and it is very painful. The surface of the skin is just as painful as the lump itself, and although there is a lump there, it is not of substance, as in I can't feel a lump under the skin, and when you stretch the area, the swollen area does not protrude.