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Since it is flaky, it could be yeast infection. You should apply over-the-counter yeast cream such as miconazole cream twice a day for 14 days. If it does work, you should take it to a vet to have its skin examined.
Or seborrhoeic dermatitis. Yeast cream also works for it. You may apply over-the-counter 1% hydrocortisone cream with the yeast cream to reduce the inflammation of an acute flare.