Why do I keep getting this yellow crust in my nose every day? I don't have allergies. (photos)

I had Rhinoplasty/Septoplasty 9 months ago and since 3 month ago I started getting this yellow crust inside my nose. I already went to see my surgeon 2 times but he keeps saying everything is ok but then why I get this crust everyday? my nose feels really dry and tight inside and sometimes I have discomfort after blowing my nose. I know some crusting is normal but is it normal every single day. I am just worry this crust could cause a septum perforation.