How Should Eyebrows Discoloration Be Treated?

How are you? Over the past two weeks I have developed snow-white areas above both eyebrows.These areas follow the contour of the eyebrows across and are abt.1/4 inch at the thickest part in height. I do not wax, pluck, use pencil or do anything to my eyebrows. I don't even wear makeup.I do use sunscreen every day.I,m just wondering why this is happening.Thank you. I am female, caucasian of puerto rican ethnicity living in S.California.I do not smoke or drink or do any type of drugs.