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This question already has an answer here:

When I was rendering my image, I noticed that it looks weird (top left, and right side). I don't know what causes this issue, never had it before.

enter image description here

useful info/settings: samples = 256 I render using my CPU Max light bounces = 12 Denoising on def settings

Thanks.

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marked as duplicate by Duarte Farrajota Ramos, cegaton, Ray Mairlot, aliasguru, David Apr 19 '18 at 0:33

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ I edited your post to embed the image, but next time please use the "add image" tool in the post editor... $\endgroup$ – m.ardito Apr 17 '18 at 19:15
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    $\begingroup$ See How to upload an image to a post? $\endgroup$ – cegaton Apr 17 '18 at 19:25
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I have had the same with the denoiser when an area has had a high frequency noise. The denoiser can't know what pixels are fireflies and what are correctly calculated pixels. It just looks at the pixels and see a lot of white dots and think it’s the real thing. Same thing happens here where you have a high frequency texture and the denoiser considers an area that is too large into account when denoising.

Try setting the radius to something low, like 4 and the strength down to .2. Another alternative would be to deactivate denoising for diffuse direct to see if that helps. But I have never tried that.

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