Welcome to Health care Magic forum,
,an autoimmune condition, is a milky white(depigmented) patch on skin with normal sensations.In your case if its not completely white it can be either a "pre-vitiligo"(early stage of vitiligo).Kindly check touch and pain sensation over the patch also.As far as treatment of vitiligo is concerned ,we do give creams and lotions which is to be applied over the patch and expose to sunlight just for 5-10 mins only.You don't need to sit for 1 hr.Kindly let me know the content of the cream prescribed to you,so that i can guide you further.There are oral medicine also for the same following which patient need to sit in sun light,after 2 hrs.Steroid cream can also be applied.Vitiligo also needs a good follow up and to be seen that the patches are increasing in number or size or not.Your thyroid
profile also needs to be checked as that too is an autoimmune condition and can be associated with vitiligo.Other condition where we get light colored patches is a fungal infection
called tinea versicolor
.So consult your doctor for the same .I am sure a dermatologist
wont miss any of the above differential diagnosis.