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Nasrul ,if the lesions are milky white in color ,then what you are having is called VITILIGO
.Its a autoimmune
condition where in our own cell start killing our melanocyte
cells in the skin and thus leading to white patches
.At times it is associated with thyroid problem also ,so you should get a blood check up done to rule out other auto immune conditions as well.
There are various treatments available in allopathy,but it depends whether the patches are spreading or not.Options available are :
1) oral and topical steroids
2) melanocyl tablets
6) other topical creams like tacrolimus and pimecrolimus.
Treatment depends upon your stage and activity of the lesion.
So consult a dermatologist who would explain you the cause and treatment options .