What Causes Warts?

Warts are the second most common skin problem we face, but how and why do they form?

Read More:
‘Warts and all’ - the history and folklore of warts: a review
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1293460/pdf/jrsocmed00115-0053.pdf
“The humble wart has undoubtedly been afflicting mankind for many millenia.”

Warts and verrucas - Symptoms
http://www.nhs.uk/Conditions/Warts/Pages/Symptoms.aspx
“Warts are not usually painful, but some types, such as verrucas, may hurt. They can occasionally itch or bleed.”

What are the different types of warts?
http://www.medicalnewstoday.com/articles/155039.php#what_are_the_different_types_of_warts
“Experts say there are several different kinds of warts.”
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Видео What Causes Warts? канала Seeker