Areola Discoloration and possible lump

In the middle of august I noticed a darker area of the areola on my left breast - looks like a bruise.  It's on the outer edge of the areola between 12:00 and 1:00 position.  The area has almost doubled in size, comparable to the size and shape of a lima bean.  I haven't felt anything unusual until last week while I was in the shower.  There is something unusual under discolored area, but I can't tell if what I am feeling is an enlarged duct, normal breast tissue or something else. It's about the 1.5cm in length and feels maybe about 1cm thick.  It's also hard to tell if it's fixed or movable. I only feel this while standing or sitting and not when I am lying down.  I guess I have a two part question.  1) Should I be concerned since I only feel the lump while standing/sitting and not while I am lying down?  2) Should I be concerned about the discolored area?  Sometimes I feel like I may over react to issues and I would hate waste anyones time.  I am 40, no chance of being pregnant, total hysterectomy 8 years ago.  I have been on the hormone Evamist since February 2009. Thanks for your help!