Which of the following conditions can lead to solar cheilitis?

Solar cheilitis, also known as actinic cheilitis, is primarily caused by prolonged exposure to ultraviolet (UV) light, particularly from the sun. The condition manifests as a change in the appearance and structure of the lips, often leading to dryness, scaling, and cracking. Chronic sun exposure results in the degeneration of the lip's epithelial tissue and may cause premalignant changes, making the lips more vulnerable to various forms of damage.

While allergic reactions, genetic predispositions, and dental trauma can cause changes or issues in the lip area, they are not the leading factors in developing solar cheilitis. Allergic reactions typically provoke localized inflammation without the specific sun-related damage seen in solar cheilitis. Genetic predisposition may influence individual susceptibility to skin conditions but does not directly cause this specific issue. Dental trauma involves injury that may affect the lip area but does not relate to the chronic ultraviolet-induced changes characteristic of solar cheilitis. Therefore, chronic sun exposure is the primary risk factor for this condition.