Is black fuzzy mold in shower dangerous to stay with?« Back to Previous Page

The grout between the tiles in our master bathroom shower has been turning from black to a fuzzy dark green over the last few weeks. It’s in the corner that never gets any sun and always feels damp, no matter how much we wipe it down. My husband thinks it’s not a big deal, but I’m worried it’s spreading. How urgently do we need to get a professional to deal with this, and is it something we can stay in the house for?
Posted by John Thompson
Asked on May 6, 2026 5:56 am
Fuzzy black or dark green mold in a shower is a common issue in Dubai due to the high humidity and constant condensation from air conditioning. While not all black-colored molds are the infamous "toxic black mold" (Stachybotrys), any persistent mold indicates a moisture problem that needs addressing.

For most healthy adults, this type of mold primarily causes irritation—worsening allergies, congestion, or respiratory discomfort. The risk increases significantly for infants, the elderly, or anyone with asthma or a compromised immune system. The constant dampness you describe is the root cause; wiping the surface doesn't address the moisture trapped within the grout and wall.

Given that it's spreading, professional assessment is recommended. In the UAE's climate, a small visible patch can hide a larger colony behind tiles. A proper inspection can determine if the issue is surface-level or if there's hidden growth requiring remediation. You can stay in the house, but using the shower less and ensuring the bathroom is well-ventilated 24/7 can help reduce spore exposure until it's resolved. For a definitive identification of the mold type and the extent of the problem, a lab test is the only way to move from concern to fact.
Posted by Sani Admin
Answered on May 7, 2026 12:47 am