Hello It look like ulcer ,may be due to heat in ur body,may be traumatic,may be burning with any hot food.use any ulcer gel and avoid hot and spicy food

1. Do you notice any white tiny spots of the tip ? 2. Any history of dehydration recently ? 3. Irregular or coarser tooth surface at lower front region? 4. Any unnoticed trauma including burn from food in recent times? There are many things which may cause this type of problems Need thorough evaluation of your oral cavity

Did you experience any hot food. At times sudden heat can cause some burning sensation. Usually it gets settled on their own as papilla gets back to its normal functioning state.