Rach, Are those the only spots you have it? Have you "checked around" to see if it is elsewhere?
Addison's can also cause "cafe au lait" spots/hyperpigmentation. I like this website:
http://www.aafp.org/afp/20031115/1955.html
Good catch, Mrs. D.
I hope you won't be afraid to bring anything up to your docs. Heck, they seem to want to diagnose anything other than MG.
Annie