I had a tooth extracted three weeks ago.  All was well until yesterday when I noticed some sort of blister forming in the hole.  At first I was excited, as I thought I was almost done with the healing process.  But today the blister has grown in size and protrudes out of the hole and past my gum line.  What is this and should I be worried about it or is that normal?
Hello and welcome. Thanks for sharing your concern. From the history posted here it appears that there is infection developed in the socket. Do you have pain too? It requires an immediate follow-up within two days, so that a suitable antibiotic can be started upon clinical evaluation.Meanwhile, please do warm saline rinses and see your dentist to the earliest. Thanks. Take care.