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Discover the different types of warts, including common warts, plantar warts, flat warts, filiform warts, mosaic warts, and genital warts. Learn about their causes, treatments and prevention tips. Discover wart types, when to see a dermatologist, and top treatments. Learn why professional care is essential for persistent wart removal. Warts are often skin-colored and feel rough, but they can be dark (brown or gray-black), flat, and smooth. Learn more about the types of warts, signs, causes, and treatments here. What is a viral wart? A viral wart is a very common benign lesion caused by infection with human papillomavirus (HPV). Viral warts can be classified by site as being cutaneous or mucosal as the HPV types are quite distinct [see Anogenital wart and Sexually acquired human papillomavirus for further information on mucosal HPV infection].