Rash on 2 year old butt and lower back that look like zits. what do i do?

variety of causes: The "zits" description leaves a lot to the imagination.This could be bites (flea, ant), yeast (candida albicans), hives (allergic) or a mild skin infection from skin germs, or bites originally that became infected later. If these do not fade over a few days and or continue to enlarge or incrase in number, an office evaluation is worth while.