I get a lot of white fluffy mould in my room on all the external walls. It appears in just over a week, having swept it off the previous time (the paint on one wall is 'suede effect' so doesn't wipe clean very well). It is very rarely black spots, mainly white. Is this likely to be due to condensation (despite airing the room and having the heating on), or another cause? The wall outside has a big crack. I've attached a photo of the mould behind my wardrobe I discovered, which was also on the back of the wardrobe, possibly explaining why the contents started growing mould. Please help advise!