Whats on my snail?

[Jaycen B.]

 

[bhodges82]

Possibly a barnacle

 

[jcook54]

Barnacle was my first thought but I've never seen one quite that big on one. I've definitely had them on snails but that thing is like pretty big compared to the snail shell itself.

 

[snarky shark]

It's not a tumor! Sorry, I couldn't resist. Lol.

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[Jaycen B.]

Haliotidae of some kind maybe?
I'm going to keep looking and see what I can find...