evidence: A number of posts on social media claim that US President Joe Biden has been seen with a large bruise on his forehead, prompting some claims that he is unfit to lead the country. One Facebook user wrote: "Look at the bruise on Joe Biden's head. That wasn't there earlier. I bet you he fell in Poland. His doctor is lying about his health and should have his medical license [sic] revoked if he thinks Biden is ok. We are in such danger with Biden." But the mark on Mr Biden’s forehead isn’t a bruise. As a practising Catholic, the president marked Ash Wednesday (on 22 February this year) with a private Mass in his hotel room in Warsaw during his trip to Poland.