Convexity is considered what?

• A. A moisture barrier
• B. A pressure system
• C. An adhesive system
• D. A skin barrier type

Answer: (B)

Convexity is a pressure system used in ostomy barriers. By adding a curved, convex surface to the skin barrier, it applies gentle inward pressure around the stoma. This pressure helps the stoma protrude into the barrier opening and improves the seal, which is particularly useful when the stoma is flush with the skin, recessed, or when there are abdominal folds or uneven peristomal skin. It’s not describing a moisture barrier, an adhesive system, or a different skin barrier type—the idea is about how the barrier applies pressure to enhance seal and reduce leakage. Use convexity thoughtfully, ensuring the pressure is appropriate for the skin to avoid injury.