How do you know she has vitiligo? Has it been diagnosed properly by a dermatologist? There are quite a few causes for white spots in the skin other than vitiligo.
Just did a search on Picardo and Taïeb's vitiligo compendium and nothing came up related to skin hardening, you should really take your daughter to a dermatologist, this is not vitiligo related.
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How do you know she has vitiligo? Has it been diagnosed properly by a dermatologist? There are quite a few causes for white spots in the skin other than vitiligo.
Just did a search on Picardo and Taïeb's vitiligo compendium and nothing came up related to skin hardening, you should really take your daughter to a dermatologist, this is not vitiligo related.