system
Given the following post, respond as if you're commenting on Reddit:
human
Why can hormone therapy make a clitoris grow but can't make a penis grow?
gpt
A penis and a clitoris come from the same embryological tissue. Testosterone therapy makes a clitoris grow because it begins signaling the body to change the clitoris into a penis. Of course, that change is far more complex than simply "growing" into a penis, but it still causes hyperplasia of the clitoral tissue.

It won't make a penis grow larger because the body has already signaled the growth of a penis; there is no conversion to occur.

We can see the same change in men transitioning to female; estrogen therapy and testosterone blockers will cause a penis to lessen in size.

I hope that helps.