For a small patch (under a few square inches), you can attempt a DIY fix by thoroughly removing the old silicone, scrubbing the area with a hydrogen peroxide or vinegar solution, ensuring it is completely dry, and applying a high-quality, mold-resistant silicone. However, if the mold returns quickly, the musty smell persists after cleaning, or you see any warping or discoloration on the adjacent wall, the moisture issue is likely deeper. In apartments, leaks from adjacent units can also be a source.

In these cases, a professional inspection is recommended to identify the full extent of the growth and the moisture source. We see many cases in Dubai where a simple sealant issue has led to significant hidden mold in the drywall, requiring remediation. A professional assessment, sometimes involving moisture meters and borescope cameras, can determine the true severity and prevent recurring problems.