Which of the following is NOT a sign of protein-energy malnutrition?

Loss of color and a wasted appearance are typically associated with protein-energy malnutrition, as they reflect the body's lack of essential nutrients needed for tissue maintenance and repair. Similarly, dull and dry hair is a common indicator of nutritional deficiencies, often linked to inadequate protein intake and other nutrient shortfalls. Loss of subcutaneous fat is also a classic sign of protein-energy malnutrition, as the body begins to use its fat stores for energy when protein intake is insufficient.

In contrast, redness and swelling of the mouth is not a typical sign of protein-energy malnutrition. This symptom is more commonly associated with conditions like Vitamin B deficiency or infections, reflecting localized inflammation or irritation rather than a systemic shortage of protein or energy. Therefore, this option does not align with the classic signs of protein-energy malnutrition, making it the correct choice for the question.