i7-6850K (8 Threads)
Broken: 2.79 5bd8ac9abfa
When using the denoiser 'Direct Glossy' can cause artifacting. The intensity of the artifact may or may not be influenced (slightly) by SSS.
Exact steps for others to reproduce the error
Create and apply glossy material to object.
Enable denoiser (with direct glossy)
Based on a (as simple as possible) attached .blend file with minimum amount of steps. Test with and without Direct Glossy. Uses default denoiser settings. If you disable both SSS on the Principled shader and the point light, the artifact shrinks.