Cheilosis is a disorder of the lips characterized by crack-like sores at the corners of the mouth.

• A. Aphthous ulcers
• B. Cheilosis
• C. Cleft palate
• D. Herpes labialis

Answer: (B)

Cheilosis refers to inflammation and cracking at the corners of the mouth, a condition often called angular cheilitis. This location-specific fissuring is exactly what the description describes, so this term is the best fit. It can be related to factors like moisture, irritation from saliva, denture issues, or nutritional deficiencies such as riboflavin (vitamin B2), and it may be complicated by fungal or bacterial growth.

Aphthous ulcers are canker sores that occur inside the mouth on the mucosa, not at the corners. Cleft palate is a birth defect where the palate does not fuse properly, creating a gap. Herpes labialis, or cold sores, typically present as grouped vesicles on an erythematous base around the lips, not as crack-like fissures at the corners.

So the description matches cheilosis best.