Final answer:
Applying a barrier/healing cream or paste on the skin is the best intervention to promote healing and prevent further skin breakdown in an infant with bladder exstrophy.
Step-by-step explanation:
When caring for an infant with bladder exstrophy and monitoring for abdominal skin excoriation, the best intervention to promote healing and prevent further skin breakdown would be to apply a barrier/healing cream or paste on the skin.
This creates a protective barrier between the skin and any irritants, helping to promote healing and prevent further damage. Cleaning the area with a scented diaper wipe may actually introduce more irritants to the skin, while keeping the bladder moist and covering it with a sterile bag or covering the area with sterile gauze pads after bathing will not directly address the skin excoriation.