Have I contracted warts?

Hey guys. I'm 20. Yesterday my friend was over & asked me what was on his hand. He thought it was some type of callous. I said it's definately a wart, and he seemed to be in denial. He was picking at it, but not to the point where it was bleeding or anything like that, just lightly while he was showing me. We were playing catch with a baseball after that, and I might have given him a handshake before he left, I really don't remember because I wasn't focusing on it at the time. Am I at risk guys? I'm worried & I do not want a wart/warts. Thanks!