In managing stoma retraction, convexity depth should be based on the depth of retraction.

• A. True
• B. False
• C. Not applicable
• D. Sometimes

Answer: (A)

Convexity depth is matched to how far the stoma retracts to create a reliable seal. When retraction occurs, the stomal opening sits back toward the skin and the surrounding skin can form a pocket, making a flat wafer less effective at sealing. Adding convexity provides outward pressure at the rim of the stoma, filling the space created by retraction and helping the flange contact the skin around the stoma to prevent leaks. If the retraction is mild, shallow or no convexity may be enough; with deeper retraction, a deeper convexity is needed to reach the stomal opening and maintain a secure seal without stressing the skin. The aim is a seal that is secure and skin-friendly, which is why convexity depth is chosen based on the depth of retraction.