Diaper Rash, What causes diaper rash?, How can I prevent and treat diaper rashes? Thehealthtime.com Diaper Rash What does diaper rash look like? Diaper rash usually causes mild redness and scaling where the diaper touches your baby’s skin. In bad cases, the rash can cause pimples, blisters and other sores on your baby’s buttocks, thighs or genital area. If the rash gets infected, it may become bright red and the skin may get swollen. Small red patches...