M.K.
Dear C.,
I know this might sound crazy, but is there any chance some dye from her diaper, Bjorn or Exersaucer could be rubbing off on her legs making it look like bruises? This happened to me the other day. It took me a day or two to realize that because it was so hot some of the color from the diaper had rubbed off on her legs making it look like gigantic bruises on her inner thighs.
Just a thought and hope it is something as simple as this.