My son is ten years old. Since his infancy he is having two white plain patches on the left temple just adjacent to the left eye. I have tried skin specialists and homeopaths, but the mark does not seem to disappear. He starts itching when he sweats and sometimes it turns pink due to excessive sweat, heat and dust. The skin specialist told me it is sun allergy and I was asked to apply an ointment which I did. It did lighten as long as I used the ointment but has again come back. What do I do Sir? Kindly suggest