1984 Philadelphia LMC With Large (Raised & Solid) Dot Above 9

Coop, it's not pierced, just a super convenient brown spot/blemish like the ones found N/E a couple mm from the dot.

No worries merclover!
I will try and get closer/clearer photos later this afternoon when I'm done work, I have seen die chips similar to this before, like the 1964 Canadian dot penny. But I also know that 1983 and 1984 Lincoln zinc cents also had a lot of issues with zinc rot bubbles, if you notice there is a bubble under directly south of the "8" that I decompressed with my nail without an issue, as with two others infront of Lincolns face, when I tried with the big dot it was solid and did not budge so I assumed it was a die chip, but that perfectly round?

This doesn't appear to be a plating blister or a corrosion dome. Instead it appears to be a perfectly circular die dent.