Mosquito/fly bite, possibly infected? help!?

my son had a mosquito or fly bite on the back of his neck. when his dad was using the buzzer to cut his hair, he accidentally nicked the bite leaving 2 small little scratches. that was 2 days ago now the bite doesn't even look like a bite. it almost looks rashy like. a few small raised red bumps that appear to almost resemble dry skin. i cleaned the area with peroxide and applied neosporin but it didn't seem to help. anybody know what it could be? help!