Answer
Not unless a clinician has instructed this. Covering the area increases absorption, and a nappy can act like an airtight dressing.
Sources for this answer
- Alclometasone Dipropionate 0.05% w/w Cream — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.