For a patch you describe as “huge,” professional remediation is strongly advised. Disturbing it incorrectly can aerosolize a massive amount of spores throughout your villa’s living space, worsening the problem. In Dubai, reputable remediation follows strict containment protocols to prevent cross-contamination, uses HEPA filtration to capture spores, and addresses the underlying moisture source—in your case, the pipe leak must be repaired first.

After remediation, a third-party clearance test is critical to verify the spore count in the air has returned to normal, safe levels. This is a standard industry practice here for providing documented proof that the environment is healthy again. Given your family’s symptoms and the scale of the growth, an inspection and professional handling is the safest course of action.