we only discovered this this morning!! But under my DD right nipple there is a lump that feels sort of like a pea. It's under the skin so not a visible lump. Bonuses how long it's Been there. And her nipple is slightly darker brown where the lump is!! Hoping to see gp in the morn, but am realky hoping someone can help to calm me from thinking it's possible for a 6 month old to have breast cancer or such!!! Eek pls help :( xxx