By papilloma virus: Warts are caused by papilloma virus infection, from a small abrasion on the knee.
Answered 4/24/2012
5.9k views
By contact: Warts are obtained by contact and he may of fallen or scraped his knee.
Answered 3/25/2013
5.9k views
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A doctor has provided 1 answer
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A doctor has provided 1 answer
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