Which condition is most likely to occur due to an improperly fitting PAP interface?

An improperly fitting Positive Airway Pressure (PAP) interface can lead to various complications and discomfort, with skin irritation being the most common issue. When the fit of the mask is not correct, it can cause friction against the skin, leading to redness, soreness, or even breakdown of the skin. This irritation occurs because the pressure from the mask can create areas of heightened stress and abrasions on the face, particularly around the bridge of the nose, cheeks, and forehead.

In cases of a poor fit, the mask may not adequately seal, which can lead to air leaks and further contribute to skin issues. It's essential to ensure that the PAP interface is sized correctly and adjusted properly to mitigate these risks. Addressing the fit can enhance the user's comfort and compliance with therapy.

While headaches, conjunctivitis, and nasal congestion may occur in certain contexts, these conditions are less directly associated with the fitting of the PAP interface compared to skin irritation. Proper fit and use of the PAP mask can greatly help in minimizing these adverse effects.