Hi Roger, it's hard to tell what it is, but you mentioned that you were playing with her, was she running around a lot? she is mostly white like my Blossom, and when she runs around or plays hard, she turns pink under her fur, she gets like a pink flush, and then it goes away. I don't know if that's what is happening to Sky. Hopefully that's all it is, but keep an eye on it, it could also be the start of hot spots, I don't have any experience with these, I have seen them. Other members have had hot spots and can maybe give more advice. I hope it's nothing serious.