What type of hypertrophy is caused by a virus?

Verruca, commonly known as warts, are a type of hypertrophy that results from a viral infection, specifically the human papillomavirus (HPV). This virus stimulates an overgrowth of the skin, leading to the characteristic raised, rough lesions seen in warts. They can appear on various parts of the body, including hands, feet, and genitals. The presence of the virus triggers the body's response, causing increased cell proliferation, which results in these hypertrophic growths.

Other options reflect different types of growths or skin conditions that do not involve viral causes. For instance, keratosis generally refers to thickened areas of skin that can be caused by sun exposure or irritation, while fibromas are benign tumors composed of fibrous or connective tissue. Adenomas are benign tumors that originate in glandular tissue and are not associated with viral infections. Understanding these distinctions is crucial for recognizing the etiology of different skin conditions.