Why is Sculptra unsafe for keloid skin?

I developed (confirmed and diagnosed) Keloids after Otoplasty, large ones. I also have a smaller keloid on my chest either from acne or spontaneously. So far i have not developed any on my face from acne or even a bad gash on my brow bone, or on my arms from vaccinations. After looking into Sculptra I have seen it stated that it should not be used on Keloid prone skin, but I couldn't find any explanation as to why or what the risks would be. I have confirmed keloid skin and I would like to understand why it would be too much of a risk for me.