White bump on snail?

[Kingkold020]

Not too sure what this is. Just got these and put them in the tank it’s only on this one trochus snail. Is it anything I should be worried about?
Edit: it’s the little white blotch in the bottom of the shell.

 

[xxkenny90xx]

Looks like some sand or a scratch on the shell showing the white underneath. Either way I wouldn't worry about it