mamaj
3 years ago this x-mas am I woke up with a huge (larger than a silver dollar) bald spot just above my temple-bare as a baby's bottom. Went to the dr. and was diagnosed "alopecia"-a listed side effect (on the fda's more recent pamphlet) of the mirena. at the time I did not know that, as I wasnt told alopecia was a poss. side effect when I had it inserted in '03. There are many other women posting about the same problem.
I asked the dr. what could cause it, and the answer was, "I dont know". bald patches kept appearing for about a year-had to keep coloring them in with my eyebrow pencil. went away by itself, I think. the only thing I changed was taking a high end multi vitamin religiously.
Yep, it could be the mirena. did your dr tell you it was alopecia? If you decide to leave it in, get WELL informed of the other side effects. they creep up on you.
Best of luck!