What is the characteristic skin change seen in riboflavin deficiency?

Riboflavin (vitamin B2) deficiency is associated with various skin changes, one of the most prominent being angular stomatitis. This condition is characterized by inflammation and cracking at the corners of the mouth. Angular stomatitis results not only from riboflavin deficiency but also from deficiencies in other B vitamins, particularly B6 and niacin, but riboflavin plays a key role in the maintenance of mucosal surfaces and skin health.

In addition to angular stomatitis, riboflavin deficiency may lead to cheilosis (cracking of the lips), glossitis (inflammation of the tongue), and dermatitis. These manifestations highlight the importance of riboflavin in cellular function and metabolism, which is critical for maintaining healthy skin and mucosal integrity.

Keratosis pilaris, psoriatic plaques, and hyperpigmentation are conditions typically not associated with riboflavin deficiency. Keratosis pilaris is a common skin condition characterized by small, rough bumps usually on the upper arms and thighs; it's related to keratinization issues, rather than vitamin deficiencies. Psoriatic plaques are associated with psoriasis, an autoimmune condition that leads to excessive skin cell production and is unrelated to vitamin deficiencies. Hyper