Diaper rash is a common form of inflamed skin (dermatitis) that appears as a patchwork of bright red skin on your baby’s bottom. Diaper rash is often related to wet or infrequently changed diapers, skin sensitivity, and chafing. It usually affects babies, though anyone who wears a diaper regularly can develop the condition.
https://www.mayoclinic.org/diseases-conditions/diaper-rash/symptoms-causes/syc-20371636

