Seawater (salt water) seems to reduce my redness on my skin. How it come possible? (photo)

I used to have acne problem and rightnow i have blemishes and lots of redness on my skin i used lots of creams for my redness and spots, they didnt helped me but whenever i go to sea after 3 days my face look amazing ( just for temporary time) how it could be possible?

No doctor answers yet