Given the climate in Dubai, with its extreme humidity and year-round reliance on AC systems, this is a very common issue. The black, fuzzy growth you describe spreading from the ceiling corner is a strong indicator of an active moisture problem, likely from a concealed leak or significant condensation. This requires immediate professional attention.

Your first step is to formally notify your landlord or property management company in writing, with photographs, and request immediate action. Do not attempt to remove it yourself, as improper handling can aerosolize harmful spores. For a definitive diagnosis and to identify the exact moisture source, a professional indoor environmental inspection is crucial. We use tools like thermal imaging cameras and moisture meters to pinpoint leaks invisible to the naked eye and conduct air and surface sampling to identify the mold species and concentration.

For expert testing and a comprehensive remediation plan, I strongly recommend you contact our specialists at Saniservice. Call us at 800-MOLDS (800-66537) or email hello@saniservice.com to schedule an inspection. We will provide a detailed report that can be used to formally outline the necessary repairs to your landlord, ensuring the problem is resolved correctly and safely.