I suppose my mickey taking was at the outlandish 'Chosen One' suggestion, since this is the preferred bandwagon for many wishing to believe in the physical displays of spiritual entities. A bit like the figure that appears in a potato or in the froth of a capuccino rather than having a face looking like some old beardy bloke, it is always Jesus himself apparently. I am sorry to hear that, but I don't accept the guilt tripping lay it on me about the mother IL I'm afraid as I could never have known.
As said, probably a chemical reaction or exposure to the elements, nothing more I'm afraid.