Once a tenant has told you that they suspect mold, a prudent owner or property manager should do a few things immediately.

First, find out if there is a water leak or water intrustion.

Second, find out how large of an area has been detected.  

Third, is there a musty smell?

Let the tenant talk and tell you all they know about the condition.

At that point you need to make a determination as to whether to hire a regular handyperson or a company with experience in mold remeditation.  The larger the area affected the more likey you will want to hire the remediation company.  Normally, an affected area of less than 10 square feet can be handled by a handyperson that knows how to clean mold.  Larger areas should be worked on by someone with some mold remediation training.  

Mold needs moisture, something to eat, and heat.  Take away the moisture and the mold problem will go away. But, you should clean up any mold or old mold.  

If you are a landlord or property manager, there is lots more to know about mold and mold remediation.  So take a class or at least google "mold remediation" and read all you can.

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