Thank you for your query.
I suggest that you do not apply anything over the white patch
and see the progress. In case it grows in size then it shall be better to show to a doctor and seek expert opinion. Fungal infections do not respond to Silderm Mixi but would get aggravated with it.
I hope I have answered your query to your satisfaction.
Wishing your daughter an early recovery.
Rajiv K Khandelwal