Am a bit concerned because the whole side of my left breast has gone numb. I have a 14 week old baby who was born 4 weeks prem by emergency section. I couldn't breast feed but expressed for 4 weeks and didn't notice any loss of sensation then. I can't feel any lumps and the appearance of the skin hasn't changed but am really worried. 
Is this just a hormone thing? Am going to the Docs on monday because I have an infection in my section site so will ask him but just wondered if anyone else had experienced anything like this before?