Donald Trump's doctor gave some insight into the neck rash that has been spotted on the back of the president's neck in recent weeks. "President Trump is using a very common cream on the right side of his neck, which is a preventative skin treatment," Dr. Sean Barbabella said in a statement to CNN on Monday, March 2. "The President is using the treatment for one week, and the redness is expected to last for a few weeks." The medical professional did not reveal the reason why Trump, 79, needed the cream. The White House has not addressed the president's skin issue.