I have been experiencing this problem for the past week, where my right nipple keeps getting hard and itches severely. I remember feeling this same feeling when I was about 11 and assumed that was part of puberty and the growth process. As I am 30 now, I doubt they're growing!
This is driving me crazy! The skin looks normal, there is no flakiness or redness. I also feel something like a tingling in my breast, similar to the letdown feeling when I was breastfeeding my daughter. I have not breastfed for over a year now.
Any ideas on what could be causing this?