Note when you first saw the mould and whether the patch grew, faded or returned. Include water marks, known leaks and work previously carried out. Approximate dates are useful when exact ones are unavailable. Give the product names used on the area and explain any rubbing, washing or repainting. Do not treat a cleaner-looking interval as proof that the original moisture concern was resolved.
Send a room view and a closer surface photograph. Ordinary housekeeping belongs in a separate one-off clean; it does not replace inspection of the patch and its moisture history.