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is a auto-immune disease and has limited treatment available.Please consult a Dermatologist
for treatment.It takes time to recover from this problem .Please try to explain her that this problem will take time to go away ;also please try to find out her mental status there should be some some stress
going in her mind .Vitiligo;& Psoriasis
are type of diseases where there is some or other mental factor involved when this disease started.
Take her for treatment & do regular follow up with doctor 7 hope for the best .