Re: what can an endocrinologist prescribe??
What symptoms or conditions do you have that you need to see an endocrinologist for? Your primary physician should refer you if you need to go, you just don't decide to go on your own. If you have seen one in the past for something, then chances are pretty good that your conditon is the cause of the acne. There are plenty or hormonal/androgen related syndromes that could be a culprit, but your primary doc would've sent you in that direction if it was warranted.
Endocrinologists are very difficult to get appts with, from my experience. You definately want a referral from a doctor that they work with or else you will sit on a waiting list for 6-8 weeks, depending on your NEED. Diabetics pretty much have standing appts, so the receptionist isn't going to squeeze you in unless you have severe and clinically evidenced need.
To answer your question though, any MD can write out a script for ANYTHING. But, as GLSheridan stated, it could be well outside of their realm. The endocrinologist would only prescribe BC for you if say, you were an insulin dependent diabetic, they may want to monitor your intake of estrogen and progesterone. They aren't immediately privy to the state of your cervix and may not have the most accurate or updated results of pap smears, so they aren't going to prescribe anything like that. Just because they can write the script doesn't mean that they will or that they would step on another doctor's toes to do it.
You don't go to the dermatologist for anti-depressants! So, use corresponding logic when choosing a doctor's specialty when you are seeking a pharmaceutical treatment.
Endocrinology is a highly complex field. If you are going to go, and you have been referred, be prepared to have lots and lots of blood taken and get ready for some time consuming scans! It's no picnic and quite frankly, I'm surprised at how casually you mention wanting to see one!
I'll assume that you do have other symptoms leading you there. What are they?