Blue smoke on take off

My buddy was behind me. He told me when I nailed it a puff of blue smoke came out of the exhaust. That was the only time it did. It doesn't smoke any other time. It usually has a puff of black smoke when I take off. This is the first time it's done this. My buddy usually follows me to shows and cruises and tells me if anything is not right. Are the rings going bad? Any help is appreciated.

Fred B