As others have pointed out, if you're swimming in an indoor pool, you'll be just fine- but if you're outdoors, your skin may darken over time from exposure to sunlight and chlorine. read more
No you can not get dark by swimming. The sport will not provide you with that sick tan that everyone loves to get. As Shane Gould has stated, it is the exposure to the sun that tans your skin. read more
The swimming is not making your skin darker. If you are swimming outside, it is likely that the sun is making your skin darker. I would suggest a waterproof sunscreen of at least 30 spf. read more