<s>[INST] Hello, I am experience discomfort on my left lower gums for the past 4 days, at first I thought I had a cancker sore but upon looking at it right now it is on my gums, not on my cheek, and it is greyish-white in colour. I'm very worried about it as the pain has increased [/INST] Hi. Welcome to Healthcaremagic.I read your query. Do you notice some cavity in corresponding teeth? If yes this can be due to infection at the root of teeth. An x-ray can be done to be sure. Or this can be due to some trauma, toothbrush injury or impingement ofsome food particle.If you had some infection in recent time, it can be due to that too.Maintain good oral hygiene. Tylenol and Ibuprofen may help in pain. Apply lignocaine gel before eating for burning prevention.Take good diet, multivitamins, lots of fluids.If it persists or worsen, get it checked by a dentist.Hope the answer helps you. Thank you. </s>