Hello Dear Thanks for your query, I will be most happy if I could help you out so no need to worry much. The problem as you have described seems to be Postanesthetic Intraoral Lesion appears usually 2-3 days after an intraoral injection of anesthetic. It is usually apthous stomatitis or herpetic stomatitis. Usually occurs due to the soft tissue injury by the injection. Usually it heals without any treatment within 7-10 days. Here I am advising few things which will fasten the healing process • Avoid hot and spicy food and beverages for 4-5 days. • Eat more green leafy vegetables. • Use Betadene/Viodine/Betakind (contains povidone iodine solution) easily available in medical stores, twice daily. • Apply topical gel like Metrogyl-Dg Forte or Rexidine-M gel (commonly chlorhexidine and metronidazole combination). Use it thrice daily for 4-5 days. Most probably symptoms should start subsiding by 2-3 days. Hope this will help you. If there is any more query or question regarding this in your mind, you are free to ask any time. Thank You and Take Care Regards