Diaper rash commonly occurs in areas covered by diapers, such as the scrotum, perineum, inner thighs, buttocks, and vulva, with symptoms including redness, blisters, ulcers, and leakage. The key to preventing diaper rash is to keep the baby’s buttocks clean and dry. It is important to choose diapers that are non-irritating and have strong absorbency, and to change them frequently to avoid the irritation of urine and stool on the skin.