I have seen this.  It is in response to inflammation...presumably from the 
yeast overgrowth in this case, but eczema can do it, too.  It can take 
weeks/months to return to normal color once the cause of the inflammation is 
taken care of.

I have a good picture of it if anyone is interested.

Kathy Leeper, MD, IBCLC
Lincoln, NE 

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