How do I fix a small area of buckling vinyl siding without tearing all the pieces around it off?

A buckle could be expansion or movement in the wall surface. Before I can help it would be good to know your thoughts on what may have caused the buckle.

I've never repaired vinyl siding this way but it may work... if you cut away a small section (as small as possible) to relieve the pressure that is causing the buckling and patch the repair with epoxy or even bondo.. after you touch it up with some exterior paint you'll probably be the only one that'll ever know there was a problem. Good luck.

The Buckle Can Be From The Siding Being Bowed From The Installation, But Most Likely It Was Either Cut To Tight, Or The Nails Were Drove Up To Tight.
Also It Is Possible That If The Siding Is Not Running Straight This Will Also Cause It To Buckle, Good Luck, Nichols Trim