Hello sir just be relax it could be normal ulcer so don’t worry but please visit to your near by dentist

Relax , it could be an ulcer , go to your doctorwho  will give soothing gel n multivitamin  tablets . It will heal

Please don't jump to such conclusions in a hurry. Even a doctor cannot confirm that diagnosis without a proper clinical examination and a biopsy. This could just be a traumatic ulcer which will Heal within 7 to 10 days uneventfully. You can use anaesthetic ointments containing benzocaine or lignocaine for temporary symptomatic relief till that time. Regards.