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 fans claim that the XO in the Weeknd's XO Crew simply stands for hugs and kisses, while others claim the letters represent the drugs Ecstasy and oxycontin. Considering the ubiquity of drugs in his songs, the latter seems likely.