Breast Bruise

I have this light bruise on the side of my right breast where my armpit lies.  My breast has been really sore and tender so I started looking and saw the bruise.  I don't know how this bruise got there because I would remember if I hit it on something. I felt my breast for knots and my right breast does feel a little different than my left breast (i think, not sure if I am just freaking out).  Is this something to be worried about?  Can you give me any insight on what this could be?

[lizzy100]

you may have injured yourself without realising. how longs it been there? i would wait to see if it goes. bruising isnt really a sign of breast cancer.

[worriedKL]

It has been there for about 3 days.  And my breast has been sore for about 4.  Sometimes my right breast gets sore in the same area before my period but it is not time for my period.  It is a little harder on that side of my breast than on the left side??

[lizzy100]

if its bruised it may feel different. its normal to have cyclic breast pain associated with periods. if its only been 3 days it could still be a bruise, if it had been a few weeks it clearly wouldnt be a normal bruise. also pain isnt usually a symptom of b cancer either. but im not a doc yet, so if ur worried sure get it checkedout its up to u.