scalp biopsy

[Bees]

Dear Dr R.

I have been loosing my hair for 5.5 months now, am 38 years old 2 children and never lost hair before not even with pregnancies, infertility and strarting or stopping b/c pills. My derm wants to do a scalp biopsy to see if it is T.E or FMB. Is it worth doing this, all my bloodwork is okay just ferritin is slightly low 48 so now I am on iron supplements. I am so stressed from this, have or should I say had thick hair and have lost about 40% in the last 5.5 months. The reason for doing this scalp biopsy is because if it is T.E. he said aldactone will not help but if it is FMB then I need to start aldactone. What are thoughts on this?