SIGNS OF MOLD IN THE HOUSE Mold in the home is a major cause of illness and is not often identified because of the difficulties surrounding mold testing. However, there are some simple steps you can take that can help you find out if you have a mold problem in your home. Look for discoloration of grout lines in between tiles in the bathroom. Bathrooms are wet and humid, two conditions promoting mold growth. So it is not uncommon to see green, brown, black or even pink mold g