Louisiana state quarter error?

I found this coin a few years ago. I saved it since I thought it was unusual, but I'm wondering what exactly it is? It's got a small bump on it. It may be hard to see in the pictures but it's big enough to easily feel it when i touch it.

 

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Could be an occluded gas bubble, A lot of these are done with heat though. Most aren't errors.

 

I will say it's not an occluded gas bubble. Those usually occur in solid Planchets such as the old Copper Planchet Cents.

I will say the Cupronickel clad received some extreme heat and caused a small blister. Post mint damage.

Not a mint error of any kind unfortunately.

 

Thanks.

 

Heat

 

Damaged after it left the mint.