Hello, Between my left nipple and my belly button, I have had for some time (at least a month) 3 irregularly shaped blotches that are at the wides point, about 1 1/2 inches across. The skin is smooth and not sensitive to the touch. The 3 blotches do not have well defined edges. I think that the color is not always the same. Right now, they re a reddish brown color. At times in the last few days or weeks, they have been both lighter in color and redder. What might this be?