Render the hair and figure in front of a transparent background, turn the denoiser on, and let it render for as long as you can. Right now it's hard to tell if it's just noisy from the lack of time in the oven or a glitch with the graphics setting or material (this is unlikely since I used this hair before and didn't have this issue).
If it is a glitch, I expect the noise to be black, not the colour of the hair.