1776 wrote: The "target space" for injection of fillers within the penis is between the collies fascia & dartos fascia -- a very thin space that is not entirely uniform around the penis.
Conventionally it's between the dartos and
buck's fascia and isn't precarious at all. In fact the technique is remarkably efficacious, as demonstrated by an overwhelming authentic patient reporting of filler injections in general. You'll find many on this site, but they have been sporadically mentioned on other PE sites as well.
What's more
"precarious" is choosing the wrong practitioner and/or filler type. There are some bad actors out there who opt to inject non-FDA approved filler cocktails (often containing silicone oil), and others opting for the use of rigid silicone implants for the purposes of augmentation (and not erectile dysfunction).
And there are a bunch of "Botox Mills" who have access to the same fillers off-label who may not understand the critical technique & methodology of injecting the filler correctly (let alone aesthetically), so your concerns are valid as someone approaching this scene. I've seen some of the work through back channels (PMs + Emails) and bad quality results very much exists and persists.
I'm here to tell you that (fortunately), there are leading Docs in the field and they are excellent at what they do. The previous poster mentioned PhalloFILL, their
Dallas Clinic
being a great option for Hyaluronic Acid (HA). Other popular fillers include PMMA (a permanent option), and
Jiva Med Spa
has put out some quality work in Ohio, and
Dr. Luis Lee
out of the Bay Area offers a bit of everything (P-Long, P-Shot, Girth Injections, etc.).
While the industry has a poor history of botcheries and has largely remained experimental (i.e. lacking standardization), I would contend that injectable phalloplasty has really come a long way in the past 10 years and we've entered the first ever
Golden Age of medical male enhancement in the 2020's.