hi there. i just noticed a bald spot on the back of my head that made me freak out. i went to the doctor and now i'm even more freaked out that it could be FPH. she referred me to a derm and ordered some blood tests. all came back normal except i'm severely deficient in vitamin D. i hope that's the cause, but do to the pattern of hair loss and since my dad is bald i think it's probably genetic. here are pics, could you give an opinion?