Article continues below advertisementAfter Joe Biden was filmed leaving a church in Rehoboth Beach, Del., over Labor Day weekend with a large gash on his forehead, his spokesperson Kelly Scully confirmed he underwent Mohs surgery to remove skin cancer.Mohs surgery rids the skin of cancerous cells by cutting away at the skin until there is no more evidence of cancer.Article continues below advertisementJoe Biden Seen With Gash on His ForeheadSource: @fredkarger/InstagramJoe Biden was seen over Labor Day weekend with a gash on his forehead.