Mold Problem

Use Mold Armor to treat, then use Mold Test Kit to test it. You can buy both in homedepot.
Mold Armor is very effective.

http://www.homedepot.com/p/Mold-Armor-1-gal-Mold-Remover-and-Disinfectant-FG550/203773308

http://www.homedepot.com/p/Mold-Armor-32-oz-Mold-Remover-and-Disinfectant-Pro-Strength-FG552/205143478