The medical staff of World Wrestling Entertainment is baffled by the dramatic decline in an injury that was once commonplace in the sport — a small gash just under the hairline.

“I can’t explain it,” said WWE’s Chief Medical Officer, Dr. Bob Ponovich. “As recently as a few years ago, our medics were frequently stitching up small-but-bloody gashes on wrestlers’ foreheads. Then, all of a sudden, we just stopped seeing this type of injury.”

Dr. Ponovich is doubly perplexed because the types of trauma that typically resulted in forehead gashes — a wrestler being thrown head-first into a steel cage, for instance — have not declined in tandem.

Equally vexing to Dr. Ponovich are reports that wresters working with the Total Nonstop Action promotion have experienced an increase in small gashes to the forehead.

“It’s a true medical mystery,” he said. “Perhaps TNA’s steel cages are made of more abrasive metal? I’m just speculating now.”

Dr. Ponovich has also noticed that, around the same time he noticed a decline in forehead gashes, WWE wrestlers stopped asking to borrow razor blades. But he figures “it’s probably unrelated. Maybe they’re just shaving less.”