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I agree that a zoomed detail view would be helpful for seeing the exact problem... but from what I see and your description, I don't think you're dealing with pure jpeg artifacts.

Regardless, here's what I see so far. You have a very obvious red color caste. If you balance your colors a bit to remove that caste, you will probably alleviate the color spots in the process. I think you're getting some hotspots in your red channel probably due to lighting and ambient colors. If you tone down the red caste, it should also tone down those red spots while you're at it. If it is indeed noise, by blurring then unsharping a channel you're removing and then replacing the noise. If you must unsharp, I would suggest it in small doses and to the composite channel after you do a blur on the single color channel.  Remember that applying a blur to each channel is just like applying a blur to the composite image. I'm not sure which you're doing from your decription, so I thought I'd throw that out. Generally when you're working with pixel noise like the kind introduced with bad digital shots, you only have to worry about one channel (usually it's blue with digital cameras). If you do a blur there, it will often fix a majority of the noise problems in a photo. You can usually do pretty heavy "fixing" on a single channel without shifting the color of your composite image. It's really case by case though.

Hope that helps some, if not, more detail on the photo will help diagnose the problem