How to fix this floor?

[acfurino]

newbie here... how do I fix the discoloration in this floor? Can I just buff it? Or does it need to be sanded and stained? If it needs to be sanded and stained, can I sand and stain that one spot or does it have to be the entire room?

Thanks,
Anthony

 

[Ernesto]

Are those water spots or where the finish is worn off?

 

[Nick]

Same question .. You're not going to sand out water stains ..

 

[acfurino]

They are not water spots

 

[Nick]

Is the finish worn off like E asked ?