I am sorry that you have had this effect catweazle, this has not happened to me, but I dilute the estriol thoroughly and only use one or twice a week and only at night, I never ever use it in the mornings and go out in the sun.
After I read your post I did a search for information , it seems that this can happen even when hormones are not used and can be genetic, when it happens in pregnancy if it is going to happen it appears in the 4th month.
Going out in the sun, and the sun has been been strong these last two weeks, brown spots on face and hands will darken if you do not apply sun block cream, I make sure I do.
Once again I am sorry this has happened.
This is for CM's daughter
http://www.youtube.com/watch?v=zJXjVvrEDYU This lady is amazing and she is 54, admittedly she sticks to a raw diet but her skin is beautiful.
Its based on an old Chinese beauty technique, have done a search but its not available in the UK yet.
silverlady x