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Hi @basmaabdo and welcome to Mayo Clinic Connect. Ichthyosis is a condition that causes widespread and persistent thick, dry, "fish-scale" skin.
https://www.mayoclinic.org/diseases-conditions/ichthyosis-vulgaris/symptoms-causes/syc-20373754
According to Mayo Clinic, the condition doesn't have a known cure so the goal is to just manage the symptoms.

What do you do for your daughter to help treat her?