John Cena makes WWE return at WrestleMania but one thing leaves viewers completely distracted

John Cena made a surprise appearance at WrestleMania 40 on Sunday, although fans were completely distracted by one thing.

WrestleMania 40 came to a close on Sunday evening with one of the most iconic main event matches in WWE history.

Cody Rhodes beat Roman Reigns to become the undisputed universal champion, over 1,300 days since Reigns took the title himself.

With the match taking place under Bloodline Rules, WWE legends John Cena, The Undertaker, The Rock and Solo Sikoa all joined in on the action to create a spectacle for the ages.

Cena's entrance was one of the highlights of the night, with the star returning to the squared circle for the first time since last year.

The 46-year-old charged in and immediately took out Solo Sikoa, before performing an Attitude Adjustment on the Bloodline member.

Cena's moment in the spotlight was short-lived though, as The Rock - irate and yelling expletives - charged into the ring.

The pair were involved in an intense stand-off, before The Final Boss dodged a Cena punch before slamming him to the matt.

Fans inside Philadelphia's Lincoln Financial Field went into a frenzy when a gong sounded to signal The Undertaker's entrance, who took out The Rock before Rhodes eventually claimed victory.

Yet despite all the drama, fans were left somewhat distracted by an aspect of Cena's appearance; his bald spot.

These days Cena sports slicked back hair rather than his infamous skinhead look, but fans noticed that he had a bald patch on the back of his head.

One person wrote: "John Cena is somehow more bald than The Rock."

A second wrote: "John Cena think all that hair gone hide that bald spot."

A third said: "Let's not lose sight of the fact that John Cena kept trying to cover his bald spot by running his fingers through his hair. We don't care boo. We can't see you, therefore, we can't see your bald spot.”

Cena has previously addressed his bald spot on WWE

Last year in a slanging match in the ring, Austin Theory taunted: "I'm not going anywhere just like that bald spot on your head ain't going anywhere."

Cena replied: "I would so much rather be bald than have them pipe in fake crowd noises for my matches because nobody cares."