Hey, can anyone please tell me what can be causing this in render settings? It seems to be coming from a yellow emission in my material. I am using Arnold renderer
Those are samples that are not finished cleaning up. You need to see if they are Specular, reflections or light samples.
BTW do you have a light inside a mesh with a glass material? if so then you will need way more samples to clean that
Those could also be fireflies and a couple of things are causing it. First, as Francisco said, check the samples you are using. Then, make sure you don't have a light too close to a surface, because it can create some fireflies. Also check this option here to see if it helps
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