For about 12 months now I have been loosing hair from the top of my head, an area of about 6 inches square. The hair in this area has now gone thin and the scalp is quite visible in certain conditions. The area from where the hair loss has occurred is quite pink/red but not sore but sometimes tingles.
I have always had a very thick head of hair and the rest of my hair remains thick despite this area of thinness. Both my parents and grandparents have good heads of hair with no distinct hair loss.
What could be causing this?