How do I fix the gap around bathtub faucet?

[arabianights]

greetings

My bathtub's faucet has a wide gap with the ceramic tile on the bathroom wall. I replaced it sometime ago but somehow after screwing tight faucet onto the waterline, it leaves a rather big gap from the wall. Now I'd like to seal it. does it make sense to fill the gap or I should better call a plumber to refit the faucet?

 

[.Scott]

I would use a tub faucet flange.
See this instruction video for details.
That video also shows this specific problem and another way of fixing it.

 

[renormalize]

You can look at videos online, like this for example: