Whether you are looking for hard science or a simple pictorial guide, there are virtually no resources available online for transgender people using testosterone in their hormone replacement therapy (HRT).

To help people going through this situation, I've assembled my own knowledge and experiences into a straightforward explanation of the "bottom growth" process.

What 'bottom growth' means

In this guide, and in general, the term "bottom growth" refers to genital changes experienced by people assigned female at birth when they undergo testosterone hormone therapy or "masculinizing" therapy. This medical process is done through the application of hormone topical gels and creams, or through hormone injections.

Many people who undergo masculinizing therapy are transgender men; others, like me, are nonbinary, including genderqueer, bigender and agender folks. For some, bottom growth is a desired effect to help alleviate