My LO is 19 months and this is the first time this has happened. I think I have plugged ducts in the outside of my left breast. It is PAINFUL to touch and nurse. It just started hurting late last night. I massaged it when LO nursed it was awful. I am taking some Ibuprophen and some amoxicillian that I have in the house also. What else should I do????? What causes this??? Thanks ladies!