Possible shell problem?

[CazRJ]

Hi All you lovely people, I have never had a snail before and although we have had our nerite snail for nearly 2 years there is an area on his shell I'm worried about.

Does this look like his shell is damaged or a portion missing?? Not sure how to help, can I give him something to strengthen his shell??

Thanks everyone in advance.

 

[Colin_T]

more pictures coz I have no idea what you are pointing at?

 

[Rocky99811 20]

more pictures coz I have no idea what you are pointing at?

You don't see that!? Tap into the pic Colin... There is a weird chunk of the shell... I habe no idea what this could be...