The damp smell and rapid appearance behind a wardrobe suggest a significant moisture source, likely a hidden plumbing leak or condensation from an AC unit. Given Dubai’s high humidity, mold can spread quickly into wall cavities, making DIY removal ineffective and potentially hazardous. A professional inspection is needed to identify and fix the root cause—simply cleaning the surface will not solve the problem.

For your safety, avoid disturbing the area. Do not attempt to clean it with bleach, as this can aerosolize spores and worsen indoor air quality. Keep the bedroom well-ventilated and consider relocating until it’s assessed.

The landlord should arrange for a certified mold remediation company to conduct the inspection and removal. The process should include containment, safe removal of affected materials, fixing the moisture source, and verification through post-remediation testing to ensure it is resolved.