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You could be having Vitiligo
. Avoid sun exposure. You can apply sunscreen cream SPF25 once a day to reduce damage of UV rays from sun. Avoid as much as possible sun exposure. Eat plenty of fresh fruits and green leafy vegetables. Drink plenty of water. Consult your Dermatologist
to get thorough checkup. There is treatment available for this like Tacrolimus ointment and even corticosteroids
. Discuss best treatment option with your Doctor.