For treatment, do not attempt to clean significant growth yourself with bleach, as this can aerosolize spores. A professional remediation company should be engaged to safely contain the area, remove the contaminated materials (like the affected section of drywall), and HEPA-vacuum the space. The root cause must be addressed; this is almost always excess moisture. An inspection should identify if it’s due to a leaking pipe, capillary rise from the ground, or, most commonly in Dubai, thermal bridging and condensation on the cold wall behind the wardrobe.

Move the furniture away from the wall immediately to improve air circulation. For your son’s health, consider temporarily relocating him until the mould is assessed, as exposure can exacerbate allergies and asthma. Look for a provider with certified mould remediation credentials (like IICRC) who offers before-and-after testing to verify the cleanup’s effectiveness, not just a generic cleaning service.