I'm 22 and looking to have aquamid injected in my buttocks by a doctor in London who is the only dr that performs this in Europe. I'm actually really eager to do this. As I am a small girl in size and have not flat but a little bottom, how much aquamid will I need to use? and how will I know if I will be alergic to this subtance and what causes infections that many have said is inevitable. May I also ask that if aquamid is not approved in England why and how the Dr is able to practice this openly?