The former Owls loanee suffered a clash of heads with teammate Junior Hoilett and left the field to applause from both sets of supporters midway through the second half.
It was one of three stoppages for head injuries in a match that saw 14 minutes of injury time played.
And Bennett, who was taken to hospital straight away, posted a reassuring selfie that showed the gruesome superficial extent of the damage.
He tweeted: “[Junior Hoilett] your head is made of concrete all good though no fracture. Great result from the boys”
Cardiff boss Neil Harris suggested they were not overly concerned as to Bennett’s condition despite the images.
He said: “He’s got a hugely swollen eye and a cut to his forehead.
“We’ll have to see how that eye settles.
“He’s been to hospital to have an x-ray, but all is clear. Hopefully he’ll travel back with us to Cardiff this evening.
“At the moment he’s all clear, he’s alright.”
An eventful afternoon for Hoilett saw him score what proved to be the winner in the eighth minute before getting away with a yellow card for a tackle that saw Liam Palmer forced off with an ankle injury.
The 2-1 defeat was Wednesday first at Hillsborough under Garry Monk and off the back of Sunday’s defeat at Stoke provides a frustrating end to 2019 that sees them in sixth place in the Championship.