Canker sore. In some cases, the exact cause of a canker sore is unknown, but trauma or injury to the mouth or oral soft tissues may be the culprit. Other possible causes are food sensitivities, spicy, salty or acidic foods, vitamin B deficiency, hormonal shifts and stress. Cold sore.
What does xoxo mean? Hugs and kisses or xoxo is a term used for expressing affection or good friendship at the end of a written letter, email or SMS text message.
XD is a laughing smile. :P is face with tongue out. In basic chat lingo, code names for emoticons are typed out on the keyboard.<br />XD, :P, :) etc stand for denoting emotions while chatting. In services like Yahoo Messenger, you already have a set of emoticons available for insertion in the text.