The rash is moist and much redder than diaper rash. The infection is caused by bacteria called streptococcus. This is the same bacteria that causes strep throat.
Perianal streptococcal dermatitis is a bright red, sharply demarcated See related patient information handout on diaper rash, written by At the same time, a four-year-old neighbor of the three children also had diaper rash.
Diaper rash is common, but don't overlook perianal strep as the that causes “ Strep Throat”) can cause local skin infection in the perianal.