US President Joe Biden sparked discussion online after a mysterious purple mark was seen on his left hand on Thursday (Jan 2) when the Democrat hosted an event at the White House to celebrate the confirmation of 235 federal judges. The purple bruise caught the attention of netizens and a series of theories and speculations stirred. 

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As the photos and videos of the event surfaced online, netizens speculated that Biden had a dark purple round bruise on his left hand which appeared to be partially covered by makeup. 

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Some people on the social media platform X suggested that the mark was that of a normal injection, while others said it's a regular mark that people in old age develop on the skin. 

Meanwhile, one X user wrote, "Looks like he may be getting injected with something." Another said, "An injection or a blood draw from the hand in a hurry so he didn't have to remove his overcoat and shirt, possibly." 

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A user wrote explaining that older people have thinning skin and less protective fat due to which such bruising develops. The user added, "Blook thinner can cause the elderly to bruise easily. Also, lack of movement in elderly individuals can lead to bruising, as well as blood being drawn for tests." 

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One even claimed the bruise is "Possibly from an IV administered to the back of the hand since he probably is suffering from vein collapse". 

(With inputs from agencies)