What deficiency is indicated by angular cheilosis, stomatitis, and glossitis in a malnourished child?

Angular cheilosis, stomatitis, and glossitis are indicative of a deficiency in niacin (Vitamin B2). This vitamin plays a critical role in maintaining healthy mucous membranes and skin. A lack of riboflavin can lead to various oral and skin symptoms, including the inflammation and lesions commonly seen in angular cheilosis (cracks at the corners of the mouth), stomatitis (inflammation of the mucous membrane in the mouth), and glossitis (inflammation of the tongue).

These clinical signs reflect the role of riboflavin in cellular respiration and the metabolism of fats, drugs, and steroids, which are essential for maintaining healthy tissues. In a malnourished child, an inadequate intake of riboflavin can quickly lead to these symptoms due to the vitamin's water-soluble nature and the body's limited capability to store it. The emphasis on oral manifestations highlights how riboflavin deficiency can significantly impact a child’s overall health and nutritional status.