<unk> s are benign epithelial tumors generally caused by infection by human papillomavirus types 1, 2, 4, 60, or 63, but have also been caused by types 57, 65, 66, and 156. These types are classified as clinical (visible symptoms). The virus attacks compromised skin through direct contact, possibly entering through tiny cuts and abrasions in the stratum corneum (outermost layer of skin). After infection,<unk> s may not become visible for several weeks or months. Because of pressure on the sole of the foot or finger, the<unk>  is pushed inward and a layer of hard skin may form over the<unk> . A<unk>  can be painful if left untreated.<unk> s may spread through autoinoculation, by infecting nearby skin, or by contaminated walking surfaces. They may fuse or develop into clusters called mosaic<unk> s.
Plantar wart
Callus
Veinoplus
Molluscum contagiosum
Broken toe
Squamous cell carcinoma
Freckle
Broken finger