Microdermabrasion cannot do much for Keratosis Pilaris inasmuch as the scales are too deep.
No good treatment exists for Keratosis Pilaris. However, moisturizing the skin with a 20% Urea cream or a 40% Urea cream can provide good temporary "masking of the problem"...
Sorry to say but microdermabrasion is such a superficial process that you are unlikely to see any benefit for the deeper structures. Go see an expert in your area in peri-orbital rejuvenation.
If you have significant facial redness from rosacea, microdermabrasion treatments may exacerbate this. I have found that IPL PhotoFacial treatments are best for reducing facial redness from rosacea. I hope this is helpful for you.