Colour defect? Bend defect?

I just bought my first iPhone, it’s only been about a week and I didn’t notice a single defect in the phone, but when I cleaned it with water (it was kinda dirty) I noticed there’s a spot where the water doesn’t go anywhere then I saw like a miscolored area (black black; spot, black grey; phone’s color) or some kind and thought it’s some kind of unnoticeable hole or a bend on the screen or maybe the glass it turns out to be something like this.

I haven’t bumped my phone anywhere or dropped my phone yet, but I feel it’s a manufacturer defect? it can be seen clearly when there’s light reflects on in, the phone is working fine it just feels kinda weird to use it after noticing this. Because since it’s corona and I don’t think it’s me I might as well ask it here. What should I do to remove it? Can I get a warranty for this?

(sorry if i miss pronouncing or else my main language is not English)