There's a fetish out there where people inject saline into their scrotum, vulva, clit, and penis. However SALINE is not testosterone oil that's meant to be injected into a muscle or SQ.
Injecting saline has it's on severe risks, including infection, rotting, and loss of body parts. Bursting is also a very real risk with saline injections. It's my personal opinion that anyone who'd do it is crazy. Anyone who'd inject T oil into their clit probably needs to be evaluated by a mental health professional.