The correct answer is Cheilosis. Explanation & Key Takeaways: • Cheilosis, also known as angular cheilitis, is an inflammatory condition that affects the corners of the mouth. • It is characterized by the formation of cracks, crusting, and scaling at the mouth corners. • Cheilosis is commonly caused by a deficiency in Vitamin B2 (riboflavin). • Other contributing factors can include fungal infections and poor oral hygiene. Related Concepts: • Vitamin B2 (Riboflavin) • Riboflavin is a water-soluble vitamin that is essential for energy production and cellular function. • It helps in the metabolism of fats, drugs, and steroids and is crucial for the conversion of carbohydrates into ATP (adenosine triphosphate). • Deficiency in riboflavin can lead to symptoms such as sore throat, redness and swelling of the lining of the mouth and throat, and cheilosis. • Psoriasis • Psoriasis is a chronic autoimmune condition that causes the rapid buildup of skin cells. • This buildup of cells causes scaling on the skin’s surface. • Inflammation and redness around the scales are fairly common. • Urticaria (Hives) • Urticaria, commonly known as hives, is a skin reaction that causes itchy welts. • It is usually caused by an allergic reaction to food, medicine, or other irritants. • Atopic Dermatitis • Atopic dermatitis, also known as eczema, is a condition that makes the skin red and itchy. • It is common in children but can occur at any age. • Atopic dermatitis is long-lasting (chronic) and tends to flare periodically.