What can I do to minimize redness from keritosis pilaris?

Essential fatty acid. Essential fatty a ida such as flaxseed oil and zinc will have abenefcal effect. Topically urea, ammonium lactate, or axelaic a i'd creams are useful.
No picking. No picking as you will get something out but will make inflammation worse. Routine care to control this common non-curable and harmless (but annoying) condition per dr. Westfried's recommendation. When the spots are inflamed, short term Hydrocortisone can be used twice daily (not longer than a week or so).