Rejuran HB V Rejuran Healer? I believe HB is A combination of Rejuran and skinboosters is that right? Why is this better?

Yesterday I tried rejuran hb (I was upsold from healer ) Also most Doctors advises that 2ml rejuran will do the whole face. The doctor I went to charged me for 3ml and then only did my cheeks and undereyes? He said some people p Chin an forehed later because it can look odd?I thought I was getting full face treatment - is this normal to only do cheeks? Will I look odd?Also do I need 4 treatments?