The risks from silicone injection cannot be understated. Assuming that it goes well, the silicone causes a lot of local damage (scar tissue and the like). It is also impossible to remove without invasive, destructive surgery. I have lumps; some from technique, some because that's just how silicone is.
If it goes less well, it can cause systemic immune problems that can leave you feeling rundown all the time.
If it goes badly and it gets into your circulatory system, it can cause lung and eye injuries, acute respiratory distress and death. A couple of years ago I had a close call with silicone. Here's a photo of me looking like crap in the hospital.
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Is it worth it? I'm still not sure. I did most of my growth at a time when I was very depressed, and didn't really care too much if it killed me. I am glad that it didn't, but I still feel the need to keep growing. 3.6 litres so far. Maybe I can reach 4 this year.
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I plan to have it removed eventually because there are many other things in life that I want to do, that the size of my genitals have made difficult or impossible. I don't regret having silicone, but I do wish that there had been alternatives like polyacrylamide aqua gel (PAAG) available when I first started my journey. PAAG looks exciting because it is relatively cheap, relatively easy to acquire and permanent, but it doesn't seem to antagonise the immune system in the same way that silicone does. Unfortunately, because I already have silicone, I am stuck with it because it is very dangerous to mix and match.