I am on HRT after a hysterectomy but have always had a little facial hair.
Seems there is a fair amount of white 'downy' hair on my chin and just under my chin which seems to grow like billy-o.
I waxed it at the start of the week but it's grown back already!! 
I know darker hair can be lasered and I will be going for that but can anything be done about this white hair to remove/reduce it on a more permanent basis and if not why has science not sorted this out yet?