While on his campaign trail last year, eagle-eyed viewers noticed the president had what looked like a nasty yellow bruise on his right hand at various points, which seemingly re-appeared in photographs when he met the French president, Emmanuel Macron, in the Oval Office in February.

Then days later in March, two darker marks were seen on the palm of the same hand which White House officials brushed off as signs Trump had simply been busy at work.

Now, the mysterious discolouration appears to have made a keen comeback as the dark mark was seen sprawled across the 78-year-old's hand again while he presented the Commander-in-Chief trophy to the Navy Midshipmen football team on Tuesday (April 15).

The lofty award is given to the winner of the American college football series with teams made up of Army, Navy and Air Force academies.

Trump spoke to the victorious team as he held a football with his name emblazoned on it as well as a championship ring while the bruise was on full show.

According to The Daily Mail, skin-colored make-up had appeared to have been used to try to conceal it.

Speculation has been spiralling over the course of the past few months that the president has some sort of health issue that requires an IV drip or blood test.