Diaper dermatitis is primarily a type of contact dermatitis that occurs because the diapers soaked with urine and feces are not changed in time. Decomposition materials in urine and feces irritate the skin, causing inflammation. The main treatment involves keeping the buttocks dry and changing diapers frequently. It is necessary to wash the buttocks, genital area, and surrounding skin with clean water daily, and to rinse the anus and surrounding skin with water after bowel movements. Diapers should be thoroughly rinsed with clean water and not wrapped with plastic on the outside. If using disposable diapers, choose ones that are soft, not rough, and breathable. If there is a bacterial or fungal infection, topical antibiotics or antifungal medications should be used. For mild cases with only redness, consider keeping the buttocks dry. In cases where there is significant erosion, some medications may be used for intervention. If there is skin redness, topical calamine lotion can be applied. If the diaper dermatitis is severe and the baby is fussy and uncomfortable, it is advised to visit a hospital for a doctor to provide treatment based on the specific condition of the baby.