Diaper rash is a common skin problem among infants. Mild diaper rash, also known as buttock rash, is a blood vessel congestion and redness in the perineum, around the anus and buttocks, and on the outer thighs, and continues to develop with exudate, epidermal peeling, and superficial ulcers that develop into deeper ulcers and even bedsores if not treated in time. Therefore, parents must not take it lightly.