Verrucae (Warts): HPV Types and Destructive Therapies
Verrucae, commonly known as warts, are benign epithelial tumors caused by various types of human papillomavirus (HPV). They are prevalent in the general population, particularly among children and young adults, and can be treated with several destructive therapies that target the lesion while sparing surrounding tissue.
Topics: warts, HPV, viral
Overview / Definition Verrucae or warts are benign epithelial lesions caused by infection with human papillomavirus (HPV). These lesions can occur on various parts of the body, including the skin and mucous membranes. They are generally self-limited but can be persistent and may require treatment for cosmetic reasons or discomfort. Epidemiology Warts are common, affecting approximately 10% of the general population at some point in their lives. They are particularly prevalent in children and adolescents, with a higher incidence in immunocompromised individuals. Key epidemiological factors include: Higher prevalence in individuals aged 5-20 years. Increased risk in individuals with a history of skin trauma. Transmission occurs through direct contact with infected skin or contaminated surfaces. Pathophysiology / Mechanism HPV infects the keratinocytes of the skin, leading to abnormal proliferation and differentiation. Over 150 types of HPV have been identified, with specific types associated with different wart forms: Common warts (Verrucae vulgaris): Primarily caused by HPV types 2 and 4. Plantar warts (Verrucae plantaris): Often caused by HPV types 1, 2, and 4. Flat warts (Verrucae plana): Associated with HPV types 3 and 10. Filiform warts: Caused by HPV types 1 and 2, characterized by a finger-like appearance. The virus causes an increase in keratinocyte turnover, resulting in the characteristic hyperkeratotic lesions. Clinical Presentation Verrucae can present in various forms depending on the type of HPV and the location of the lesion: Common warts: Rough, raised lesions, typically found on fingers, elbows, and knees. Plantar warts: Flat, painful lesions on the soles of the feet, often with a characteristic black dot (thrombosed capillaries). Flat warts: Small, smooth lesions often occurring in groups on the face, arms, and legs. Filiform warts: Long, narrow lesions that appear on the face, particularly around the eyelids and lips. Warts are usually asymptomatic;