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White patches with white hair over it indicates VITILIGO
.This is a auto immune condition where in our own cell destroy our melanocytes (color producing cells),thus leading to white patches.Treatment depends whether the lesions are active(spreading) or stable(not spreading).If the lesion is spreading then we put the patient on oral steroids
to stop the activity.Along with this one has to start phototherapy
also .There are two types of phototherapy : one is PUVA
therapy and other is NARROW BAND UVB therapy.These are light chambers which patient has to expose to .This would help in repigmentation.Apart from this one has to apply topical creams too.
vitiligo is a chronic problem and presence of white hair delays the process of repigmentation .So consult a dermatologist
who has above facilities.