Hard boil bump on the extraction site.

I have extracted my upper wisdom tooth 8 weeks back. It was erupted tooth and I had no stitches. I went for follow up after 2 weeks and it was fine. Since last week, I see a hard boiled blister like heat boil but with no pus. If I touch it, it feels so hard and pointy. But looks like blister bump. But hard to touch. It's on tht gum of the extraction site. Is this normal? I run over the tongue over the wisdom tooth site and the hole is closed now. I didn't have any stitches. I see some gap between the second molar and the extraction site. Feels little gap where there is no hard gum and feels loose gap when I run over the tongue. I have some lower jaw pain and neck pain with swelling going for 3 months. I couldn't feel any pain from this extraction site. But if I touch or press the blister, it's so sore and tender after pressing. It hurts after that. Its so hard feels sharp to touch. Is this normal?