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What you're describing is a classic scenario in Dubai, especially on exterior walls. The combination of high outdoor humidity and cold air conditioning inside creates significant condensation within the wall cavity, which leads to mold growth you can't see. The black spots are likely just the visible portion.

For a situation where you suspect hidden mold, a basic visual inspection is insufficient. You need a company that uses a borescope to inspect inside the wall cavity and employs professional-grade moisture meters to map the dampness. The most critical step is comprehensive air and surface sampling, which must be analyzed by an accredited microbiology lab to identify the mold species and concentration. This lab report is your evidence of the problem's scope and is essential for planning any remediation.

Look for a provider that is certified by a recognized body like the IICRC and can explicitly explain their diagnostic process. They should provide a detailed report with lab findings and a clear scope of work, not just a quote for removal. Any reputable inspector will also investigate the source of the moisture, as simply cleaning the mold without fixing the underlying condensation issue will result in it returning quickly.