One of my upper molars was filled a week ago because I got cavity in it. Everything went well and I only have a mild pain now. Recently, I noticed a blood blister on my gum behind the filled molar. It hurts to touch. Yesterday, it was very painful. I do not know where it came from and I want to get rid of it. Can I pierce the blister or do I need to see dentist? Please advise.
Thank you in advance for your answers!