Your situation, with the mold on an exterior wall and increased humidity, is a classic Dubai scenario. The constant AC use creates cold surfaces, and when humid outdoor air meets these cold interior walls (especially behind furniture blocking airflow), condensation forms, providing the perfect environment for mold. Your AC isn’t creating the mold spores, but if its drain line is clogged or the unit is blowing excess humidity into the room, it can exacerbate the problem.

The first step is to arrange a professional inspection. Do not attempt to clean it yourself with bleach, as this can agitate the spores and spread them, and it won’t address the moisture source. A certified inspector will use a moisture meter to pinpoint the water intrusion—whether it’s condensation, a tiny leak in the building envelope, or another issue. They should also take tape or air samples for lab analysis to identify the species, which is the only way to confirm the actual risk level.

For remediation, look for companies that follow standards like the IICRC S520, which includes containment of the area, HEPA filtration, and safe removal of contaminated materials. The key is fixing the moisture problem first; otherwise, the mold will simply return. Once the wall is dry and the leak or condensation issue is resolved, the affected section of drywall will likely need to be cut out and replaced.