疣是人类乳头瘤病毒（HPV）所引起，以往认为这些疾病是慢性良性疾病，但发现HPV感染后有一部分会导致恶性肿瘤，如皮肤癌、舌癌和宫颈癌等，因而引起人们的重视。

Use machine: SDL

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SDL: It is a human papilomavirus (HPV), previously thought to be caused by these diseases are chronicdiseases, but found benign HPV infection is a part of the cause of malignanttumors, such as skin cancer, Tongue cancer such as cervical and breast cancer,and this has aroused the attention of the people. It is caused by the virus tocells of a primary response accretion of leather superficial table of benign.Infected about potential four months or so. More likely to young people.

Human: This is caused by human papiloma virus (HPV). Previously, it was thought that these diseases were chronic,but it has been found some benign HPV could cause malignant tumors, such asskin cancer, tongue cancer, cervical cancer, etc. This has aroused the attention for these diseases.