Opening windows and doors during and after showering is a good idea to keep the moisture down. However, if you live in high humidity area you still might have a problem. If the mold is coming from a specific point, you may have a leak that should get checked out.

If you have a persistent mold problem, you should also clean with a bleach solution. After cleaning the tiles/problem areas, spray the area with a bleach and water solution or other cleaning product containing bleach. I like to use Clorox Clean-up. If you have a problem with the walls or ceiling. Use the same bleach solution/cleaner to periodically wipe down the walls and ceiling, this will help to keep the problem under control.

Before you clean the mold if you are worried, you may want to get it tested. It is not a big deal, you can usually take a sample and mail it off to a lab to get tested. I have given you a couple of links below for different services, but there are certainly more out there.

http://www.homemoldtestkits.com/
http://www.prolabinc.com/products.asp?kit=mold

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