The US Commander-in-Chief sparked concerns earlier this year after a large dark mark was spotted on his hand - and an expert has offered an explanation as to what it might be ...

A conspicuous bruise on Trump's right hand has resurfaced, just days after he touted receiving the "highest mark" during a nearly five-hour physical exam.

Checking the number of platelets in the blood can help with diagnosing certain diseases or conditions The test involves drawing blood from a vein in the arm or hand ... a small mark or bruise.

A check mark. It indicates that ... Avoid moving your hand or finger while waiting for the reading. In a few seconds, the device will display your blood oxygen level as %SpO2.

Donald Trump's mysterious mark has reappeared, new pictures have shown, with experts proposing a new theory as to what might have caused the unusual patch on his hand. Eagle-eyed observers have ...