The spots can be seen all over the attached image but I’ve highlighted where it is the most visible, I’ve tried changing lens flare, bloom and even chromatic aberration, but in most of my renders this spots seems to appear and I can’t see what I can do to fix it
Are you using self-illuminated materials? If so, you’ll need to add some other light sources because the lighting from that material by itself will produce those kind of splotches.
I am using both, self illuminated and light sources.
Maybe do a test where you disable the self-illuminated material and have the scene lighted only with regular lights and see if you have the same issue. It could be your regular lights are not bright enough.