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.
Some however have a simpler explanation for this, such as O looks like a pair of arms going around a person in a hug. XOXO is made popular by mainstream media today because of the TV series Gossip Girl, wherein the narrator of the story always signs off with XOXO after every episode.