AFAIK you should have been fully developed by 16 years old. I started puberty at 11-12 years old and didn’t notice any increase in size between 13, and 17 (when I started taking Accutane.)
If you didn’t develop ED or libido loss from it, then I doubt it had much of an effect on you in regard to size, but who can really say for sure.
Some info on webmd states that at ~16 years old, you should be close to full size, although the same article states that penis growth may continue until 18 if you went through puberty late:
When does a penis stop growing?
Your penis stops growing when you finish puberty. Exactly when that happens, though, varies from person to person. Everyone develops at a different pace. You may take longer than your friends or less time than them to finish puberty. But by 16, your body and its parts should be close to your adult size.
To answer your questions:
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There is no evidence that Accutane inhibits 5-AR type II.
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There is evidence that Accutane has a profound effect on 5-AR type I and several other steroidogenic enzymes.
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5-AR type I is expressed in genital skin, along with type II, although I don’t know what releveance that would have in influencing penis growth.
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There is evidence that Accutane drastically reduces androgen receptor (AR) levels during treatment.
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There have been guys who mention tissue damage (peyronies) and reduction of fully-erect size after developing post-Accutane syndrome.
Would you consider yourself to be a post-Accutane syndrome patient, or are you simply concerned about Accutane possibly halting penis growth?
Please follow Pete’s recommendations. At least fill out the member template so we know what types of long-term side effects you have.