My 8 yr old so has raised red dots on his face, butt, and a few on his back and chest and behind his ears. What could this be?

8 yo rash. It is important to describe the red dots a little more. Do they start off like pimples? Do the evolve to form sores or crust? Are they spreading over the body? The biggest concern in kids & summertime are bug bites that get infected and spread like wild fire (called "impetigo"). This needs an antibiotic like keflex. Simple bug bites are another possibility. Heat rash is another (inflamed pores).