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Deepak if the patches are milky white then it is vitiligo
..or if it is just a color lighter than the original color then it can be tenia versicolor
.And i hope that the sensation over the patch are normal.For vitiligo you can use any mild steroid
cream topically .You can apply melanocyl sol (diluted) over it and expose to sunlight for few minutes.If the patch is spreading or if you are getting new patches then you also need oral steroid to stop the progression.Kindly consult a dermatologist
for proper treatment.